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Taranova A, Akbar K, Yusupov K, You S, Polewczyk V, Mauri S, Balliana E, Rosen J, Moras P, Gradone A, Morandi V, Moretti E, Vomiero A. Author Correction: Unraveling the optoelectronic properties of CoSb x intrinsic selective solar absorber towards high-temperature surfaces. Nat Commun 2024; 15:3548. [PMID: 38670951 PMCID: PMC11053046 DOI: 10.1038/s41467-024-47332-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2024] Open
Affiliation(s)
- Anastasiia Taranova
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy
| | - Kamran Akbar
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
| | - Khabib Yusupov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden
| | - Shujie You
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87, Luleå, Sweden
| | - Vincent Polewczyk
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste, I-34149, Italy
| | - Silvia Mauri
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste, I-34149, Italy
- Dipartimento di Fisica, University of Trieste, via A. Valerio 2, 34127, Trieste, Italy
| | - Eleonora Balliana
- Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Scientific Campus Via Torino 155/b, 30173, Venice, Italy
| | - Johanna Rosen
- Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden
| | - Paolo Moras
- Istituto di Struttura della Materia (ISM) - CNR, S.S. 14 Km 163.5, Trieste, I-34149, Italy
| | - Alessandro Gradone
- Istituto per la Microelettronica ed i Microsistemi (IMM) - CNR Sede di Bologna, via Gobetti 101, 40129, Bologna, Italy
| | - Vittorio Morandi
- Istituto per la Microelettronica ed i Microsistemi (IMM) - CNR Sede di Bologna, via Gobetti 101, 40129, Bologna, Italy
| | - Elisa Moretti
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
| | - Alberto Vomiero
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87, Luleå, Sweden.
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Masci M, Missineo A, Campanale CM, Moras P, Colucci MC, Pasquini L, Toscano A. Case Report: An unusual case of a transposition of the great arteries with a double aortic arch: a highly complex fetal diagnosis with an unpredictable outcome. Front Cardiovasc Med 2024; 11:1351530. [PMID: 38682104 PMCID: PMC11045998 DOI: 10.3389/fcvm.2024.1351530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 03/25/2024] [Indexed: 05/01/2024] Open
Abstract
Published data estimate the prevalence of the vascular ring at approximately 7 per 10,000 live births. The association of a double aortic arch with a D-transposition of the great arteries has been rarely described in the literature. In this study, we report the prenatal diagnosis of a 28-year-old woman. A fetal echocardiography at a gestational age of 24 weeks + 6 days showed a D-transposition of the great arteries and a double aortic arch with a ventricular septal defect and pulmonary stenosis. On the first night after birth, the baby experienced an increase in lactate levels, with the rate of oxygen saturation consistently below 80%. A few hours after birth, the patient underwent a Rashkind procedure. An echocardiography, CT chest x-ray, and CT angiogram confirmed a diagnosis with a severe reduction of the tracheal lumen (>85%) and bronchomalacia. Then, the patient underwent posterior tracheopexy and aortopexy and later an arterial switch operation, ventricular septal defect closure, and resection of a part of the infundibular septum, accepting the risk of potential neoaortic obstruction. The literature has reported only two cases of patients with a fetal echocardiogram diagnosis. Therefore, our patient is only the third one with a fetal diagnosis and the second one with a complex intracardiac anatomy, characterized not only by a ventricular septal defect but also by two separate components of the obstruction (a bicuspid valve and a dysplastic valve with a posterior deviation of the infundibular septum). In conclusion, a D-transposition of the great arteries with a double aortic arch remains an extremely unusual association. The clinical outcome of these patients presents a high degree of variability and is entirely unpredictable in prenatal life. Our greatest aim as fetal and perinatal cardiologists is to improve the management and outcome of these patients through a fetal diagnosis, recognizing types of congenital heart disease in newborns who require early neonatal invasive procedures.
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Affiliation(s)
- M. Masci
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - A. Missineo
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - C. M. Campanale
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - P. Moras
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - M. C. Colucci
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
| | - L. Pasquini
- Department of Maternal-Fetal Medicine, Catholic University of the Sacred Heart, Rome, Italy
| | - A. Toscano
- Perinatal Cardiology Unit, Bambino Gesù Children’s Hospital IRCCS, Rome, Italy
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3
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Laterza S, Caretta A, Bhardwaj R, Moras P, Zema N, Flammini R, Malvestuto M. Doping dependent intrinsic magnetization in silicon in Ni/Si heterostructures. Sci Rep 2024; 14:1329. [PMID: 38225375 PMCID: PMC10789780 DOI: 10.1038/s41598-023-50795-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 12/26/2023] [Indexed: 01/17/2024] Open
Abstract
This investigation delves into the complex interaction at metal-semiconductor interfaces, highlighting the magnetic proximity effect in Ni/Si interfaces through systematic X-ray magnetic circular dichroism (XMCD) studies at Ni and Si edges. We analyzed two Ni/Si heterostructures with differing semiconductor doping, uncovering a magnetic proximity effect manifesting as equilibrium magnetization in the semiconductor substrate induced by the adjacent Ni layer. Our results display distinct magnetization signs corresponding to the doping levels: low-doped samples show parallel alignment to the Ni layer, while high-doped samples align antiparallel, indicating a nuanced interplay of underlying magnetization mechanisms. These findings pinpoint the roles of electron tunneling and exchange splitting modification in the magnetization behavior. The study enriches the understanding of ferromagnetic-semiconductor interface behavior, setting a precedent for the design of advanced spintronic devices that leverage the nuanced magnetic properties of these hybrid systems.
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Affiliation(s)
- Simone Laterza
- Department of Physics, University of Trieste, Via A. Valerio 2, 34127, Trieste, Italy
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149, Trieste, Italy
| | - Antonio Caretta
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149, Trieste, Italy
| | - Richa Bhardwaj
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149, Trieste, Italy
| | - Paolo Moras
- CNR-ISM, Consiglio Nazionale Delle Ricerche, Area Science Park, Strada Statale 14, km 163.5, Basovizza, Trieste, 34149, Italy
| | - Nicola Zema
- CNR-ISM, Consiglio Nazionale Delle Ricerche, via del Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Roberto Flammini
- CNR-ISM, Consiglio Nazionale Delle Ricerche, via del Fosso del Cavaliere 100, 00133, Rome, Italy
| | - Marco Malvestuto
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14-km 163.5 in AREA Science Park, Basovizza, 34149, Trieste, Italy.
- CNR-IOM, Consiglio Nazionale Delle Ricerche, Area Science Park, Strada Statale 14, km 163.5, Basovizza, Trieste, 34149, Italy.
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4
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Dettmann D, Sheverdyaeva PM, Hamzehpoor E, Franchi S, Galeotti G, Moras P, Ceccarelli C, Perepichka DF, Rosei F, Contini G. Electronic Band Engineering of Two-Dimensional Kagomé Polymers. ACS Nano 2024; 18:849-857. [PMID: 38147033 DOI: 10.1021/acsnano.3c09476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2023]
Abstract
Two-dimensional conjugated polymers (2DCPs) are an emerging class of materials that exhibit properties similar to graphene yet do not have the limitation of zero bandgap. On-surface synthesis provides exceptional control on the polymerization reaction, allowing tailoring properties by choosing suitable monomers. Heteroatom-substituted triangulene 2DCPs constitute a playing ground for such a design and are predicted to exhibit graphene-like band structures with high charge mobility and characteristic Dirac cones in conduction or valence states. However, measuring these properties experimentally is challenging and requires long-range-ordered polymers, preferably with an epitaxial relationship with the substrate. Here, we investigate the electronic properties of a mesoscale-ordered carbonyl-bridged triphenylamine 2DCP (P2TANGO) and demonstrate the presence of a Dirac cone by combining angle-resolved photoemission spectroscopy (ARPES) with density functional theory (DFT) calculations. Moreover, we measure the absolute energy position of the Dirac cone with respect to the vacuum level. We show that the bridging functionality of the triangulene (ether vs carbonyl) does not significantly perturb the band structure but strongly affects the positioning of the bands with respect to the Au(111) states and allows control of the ionization energy of the polymer. Our results provide proof of the controllable electronic properties of 2DCPs and bring us closer to their use in practical applications.
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Affiliation(s)
- Dominik Dettmann
- Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique Department, 1650 Boulevard Lionel-Boulet, J3X 1P7, Varennes, Québec, Canada
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Polina M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy
| | - Ehsan Hamzehpoor
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, H3A 0B8, Montreal, Quebec, Canada
| | - Stefano Franchi
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Gianluca Galeotti
- Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique Department, 1650 Boulevard Lionel-Boulet, J3X 1P7, Varennes, Québec, Canada
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy
| | - Chiara Ceccarelli
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
| | - Dmytro F Perepichka
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, H3A 0B8, Montreal, Quebec, Canada
| | - Federico Rosei
- Centre Énergie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique Department, 1650 Boulevard Lionel-Boulet, J3X 1P7, Varennes, Québec, Canada
| | - Giorgio Contini
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
- Department of Physics, University Tor Vergata, Via della Ricerca Scientifica 1, 00133 Rome, Italy
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5
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Pazniak H, Plugin IA, Sheverdyaeva PM, Rapenne L, Varezhnikov AS, Agresti A, Pescetelli S, Moras P, Kostin KB, Gorokhovsky AV, Ouisse T, Sysoev VV. Alcohol Vapor Sensor Based on Quasi-2D Nb 2O 5 Derived from Oxidized Nb 2CT z MXenes. Sensors (Basel) 2023; 24:38. [PMID: 38202899 PMCID: PMC10780349 DOI: 10.3390/s24010038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 12/07/2023] [Accepted: 12/14/2023] [Indexed: 01/12/2024]
Abstract
MXenes are two-dimensional (2D) materials with a great potential for sensor applications due to their high aspect ratio and fully functionalized surface that can be tuned for specific gas adsorption. Here, we demonstrate that the Nb2CTz-based sensor exhibits high performance towards alcohol vapors at temperatures up to 300-350 °C, with the best sensitivity towards ethanol. We attribute the observed remarkable chemiresistive effect of this material to the formation of quasi-2D Nb2O5 sheets as the result of the oxidation of Nb-based MXenes. These findings are supported by synchrotron X-ray photoelectron spectroscopy studies together with X-ray diffraction and electron microscopy observations. For analyte selectivity, we employ a multisensor approach where the gas recognition is achieved by linear discriminant analysis of the vector response of the on-chip sensor array. The reported protocol demonstrates that MXene layers are efficient precursors for the derivation of 2D oxide architectures, which are suitable for developing gas sensors and sensor arrays.
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Affiliation(s)
- Hanna Pazniak
- Laboratoire des Matériaux et du Génie Physique, Institut Polytechnique de Grenoble, Centre National de la Recherche Scientifique, Université Grenoble Alpes, CS 50257, 38016 Grenoble, Cedex 1, France; (L.R.); (T.O.)
| | - Ilya A. Plugin
- Physico-Technical Institute, Yuri Gagarin State Technical University of Saratov, ul. Polytechnicheskaya 77, Saratov 410054, Russia; (I.A.P.); (A.S.V.); (K.B.K.); (A.V.G.)
| | - Polina M. Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), SS 14, Km 163.5, 34149 Trieste, Italy; (P.M.S.); (P.M.)
| | - Laetitia Rapenne
- Laboratoire des Matériaux et du Génie Physique, Institut Polytechnique de Grenoble, Centre National de la Recherche Scientifique, Université Grenoble Alpes, CS 50257, 38016 Grenoble, Cedex 1, France; (L.R.); (T.O.)
| | - Alexey S. Varezhnikov
- Physico-Technical Institute, Yuri Gagarin State Technical University of Saratov, ul. Polytechnicheskaya 77, Saratov 410054, Russia; (I.A.P.); (A.S.V.); (K.B.K.); (A.V.G.)
| | - Antonio Agresti
- Center for Hybrid and Organic Solar Energy, Electronic Engineering Department, University of Rome Tor Vergata, 00133 Rome, Italy; (A.A.); (S.P.)
| | - Sara Pescetelli
- Center for Hybrid and Organic Solar Energy, Electronic Engineering Department, University of Rome Tor Vergata, 00133 Rome, Italy; (A.A.); (S.P.)
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), SS 14, Km 163.5, 34149 Trieste, Italy; (P.M.S.); (P.M.)
| | - Konstantin B. Kostin
- Physico-Technical Institute, Yuri Gagarin State Technical University of Saratov, ul. Polytechnicheskaya 77, Saratov 410054, Russia; (I.A.P.); (A.S.V.); (K.B.K.); (A.V.G.)
| | - Alexander V. Gorokhovsky
- Physico-Technical Institute, Yuri Gagarin State Technical University of Saratov, ul. Polytechnicheskaya 77, Saratov 410054, Russia; (I.A.P.); (A.S.V.); (K.B.K.); (A.V.G.)
| | - Thierry Ouisse
- Laboratoire des Matériaux et du Génie Physique, Institut Polytechnique de Grenoble, Centre National de la Recherche Scientifique, Université Grenoble Alpes, CS 50257, 38016 Grenoble, Cedex 1, France; (L.R.); (T.O.)
| | - Victor V. Sysoev
- Physico-Technical Institute, Yuri Gagarin State Technical University of Saratov, ul. Polytechnicheskaya 77, Saratov 410054, Russia; (I.A.P.); (A.S.V.); (K.B.K.); (A.V.G.)
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6
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Kamal S, Seo I, Bampoulis P, Jugovac M, Brondin CA, Menteş TO, Šarić Janković I, Matetskiy AV, Moras P, Sheverdyaeva PM, Michely T, Locatelli A, Gohda Y, Kralj M, Petrović M. Unidirectional Nano-modulated Binding and Electron Scattering in Epitaxial Borophene. ACS Appl Mater Interfaces 2023. [PMID: 38041641 DOI: 10.1021/acsami.3c14884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2023]
Abstract
A complex interplay between the crystal structure and the electron behavior within borophene renders this material an intriguing 2D system, with many of its electronic properties still undiscovered. Experimental insight into those properties is additionally hampered by the limited capabilities of the established synthesis methods, which, in turn, inhibits the realization of potential borophene applications. In this multimethod study, photoemission spectroscopies and scanning probe techniques complemented by theoretical calculations have been used to investigate the electronic characteristics of a high-coverage, single-layer borophene on the Ir(111) substrate. Our results show that the binding of borophene to Ir(111) exhibits pronounced one-dimensional modulation and transforms borophene into a nanograting. The scattering of photoelectrons from this structural grating gives rise to the replication of the electronic bands. In addition, the binding modulation is reflected in the chemical reactivity of borophene and gives rise to its inhomogeneous aging effect. Such aging is easily reset by dissolving boron atoms in iridium at high temperature, followed by their reassembly into a fresh atomically thin borophene mesh. Besides proving electron-grating capabilities of the boron monolayer, our data provide comprehensive insight into the electronic properties of epitaxial borophene which is vital for further examination of other boron systems of reduced dimensionality.
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Affiliation(s)
- Sherif Kamal
- Centre for Advanced Laser Techniques, Institute of Physics, 10000 Zagreb, Croatia
| | - Insung Seo
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan
| | - Pantelis Bampoulis
- Physics of Interfaces and Nanomaterials, MESA+ Institute, University of Twente, 7522 NB Enschede, The Netherlands
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
| | - Matteo Jugovac
- Elettra─Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Carlo Alberto Brondin
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, 30172 Venice, Italy
| | - Tevfik Onur Menteş
- Elettra─Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Iva Šarić Janković
- Faculty of Physics and Centre for Micro- and Nanosciences and Technologies, University of Rijeka, 51000 Rijeka, Croatia
| | - Andrey V Matetskiy
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Polina M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Thomas Michely
- Institute of Physics II, University of Cologne, 50937 Cologne, Germany
| | - Andrea Locatelli
- Elettra─Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Yoshihiro Gohda
- Department of Materials Science and Engineering, Tokyo Institute of Technology, Yokohama 226-8502, Japan
| | - Marko Kralj
- Centre for Advanced Laser Techniques, Institute of Physics, 10000 Zagreb, Croatia
| | - Marin Petrović
- Centre for Advanced Laser Techniques, Institute of Physics, 10000 Zagreb, Croatia
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Taranova A, Akbar K, Yusupov K, You S, Polewczyk V, Mauri S, Balliana E, Rosen J, Moras P, Gradone A, Morandi V, Moretti E, Vomiero A. Unraveling the optoelectronic properties of CoSb x intrinsic selective solar absorber towards high-temperature surfaces. Nat Commun 2023; 14:7280. [PMID: 37949914 PMCID: PMC10638324 DOI: 10.1038/s41467-023-42839-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 10/24/2023] [Indexed: 11/12/2023] Open
Abstract
The combination of the ability to absorb most of the solar radiation and simultaneously suppress infrared re-radiation allows selective solar absorbers (SSAs) to maximize solar energy to heat conversion, which is critical to several advanced applications. The intrinsic spectral selective materials are rare in nature and only a few demonstrated complete solar absorption. Typically, intrinsic materials exhibit high performances when integrated into complex multilayered solar absorber systems due to their limited spectral selectivity and solar absorption. In this study, we propose CoSbx (2 < x < 3) as a new exceptionally efficient SSA. Here we demonstrate that the low bandgap nature of CoSbx endows broadband solar absorption (0.96) over the solar spectral range and simultaneous low emissivity (0.18) in the mid-infrared region, resulting in a remarkable intrinsic spectral solar selectivity of 5.3. Under 1 sun illumination, the heat concentrates on the surface of the CoSbx thin film, and an impressive temperature of 101.7 °C is reached, demonstrating the highest value among reported intrinsic SSAs. Furthermore, the CoSbx was tested for solar water evaporation achieving an evaporation rate of 1.4 kg m-2 h-1. This study could expand the use of narrow bandgap semiconductors as efficient intrinsic SSAs with high surface temperatures in solar applications.
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Affiliation(s)
- Anastasiia Taranova
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy
| | - Kamran Akbar
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
| | - Khabib Yusupov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden
| | - Shujie You
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87, Luleå, Sweden
| | - Vincent Polewczyk
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste, I-34149, Italy
| | - Silvia Mauri
- Istituto Officina dei Materiali (IOM) - CNR, Laboratorio TASC, Area Science Park, S.S. 14 Km 163.5, Trieste, I-34149, Italy
- Dipartimento di Fisica, University of Trieste, via A. Valerio 2, 34127, Trieste, Italy
| | - Eleonora Balliana
- Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Scientific Campus Via Torino 155/b, 30173, Venice, Italy
| | - Johanna Rosen
- Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83, Linköping, Sweden
| | - Paolo Moras
- Istituto di Struttura della Materia (ISM) - CNR, S.S. 14 Km 163.5, Trieste, I-34149, Italy
| | - Alessandro Gradone
- Istituto per la Microelettronica ed i Microsistemi (IMM) - CNR Sede di Bologna, via Gobetti 101, 40129, Bologna, Italy
| | - Vittorio Morandi
- Istituto per la Microelettronica ed i Microsistemi (IMM) - CNR Sede di Bologna, via Gobetti 101, 40129, Bologna, Italy
| | - Elisa Moretti
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
| | - Alberto Vomiero
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, 30172, Venice, Italy.
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, SE-971 87, Luleå, Sweden.
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8
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Matetskiy AV, Milotti V, Sheverdyaeva PM, Moras P, Carbone C, Mihalyuk AN. Interplay between magnetic order and electronic band structure in ultrathin GdGe 2 metalloxene films. Nanoscale 2023; 15:16080-16088. [PMID: 37750836 DOI: 10.1039/d3nr03398h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Dimensionality can strongly influence the magnetic structure of solid systems. Here, we predict theoretically and confirm experimentally that the antiferromagnetic (AFM) ground state of bulk gadolinium germanide metalloxene, which has a quasi-layered defective GdGe2 structure, is preserved in the ultrathin film limit. Ab initio calculations demonstrate that ultrathin GdGe2 films present in-plane intra-layer ferromagnetic coupling and AFM inter-layer coupling in the ground state. Angle-resolved photoemission spectroscopy finds the AFM-induced band splitting expected for the 2 and 3 GdGe2 trilayer (TL) films, which disappear above the Néel temperature. The comparative analysis of isostructural ultrathin DyGe2 and GdSi2 films confirms the magnetic origin of the observed band splitting. These findings are in contrast with the recent report of ferromagnetism in ultrathin metalloxene films, which we ascribe to the presence of uncompensated magnetic moments.
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Affiliation(s)
- Andrey V Matetskiy
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy.
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia.
| | - Valeria Milotti
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy.
| | - Polina M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy.
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy.
| | - Carlo Carbone
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149, Trieste, Italy.
| | - Alexey N Mihalyuk
- Institute of Automation and Control Processes FEB RAS, 690041 Vladivostok, Russia.
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, 690950 Vladivostok, Russia
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9
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Milotti V, Cacovich S, Ceratti DR, Ory D, Barichello J, Matteocci F, Di Carlo A, Sheverdyaeva PM, Schulz P, Moras P. Degradation and Self-Healing of FAPbBr 3 Perovskite under Soft-X-Ray Irradiation. Small Methods 2023; 7:e2300222. [PMID: 37287372 DOI: 10.1002/smtd.202300222] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/08/2023] [Indexed: 06/09/2023]
Abstract
The extensive use of perovskites as light absorbers calls for a deeper understanding of the interaction of these materials with light. Here, the evolution of the chemical and optoelectronic properties of formamidinium lead tri-bromide (FAPbBr3 ) films is tracked under the soft X-ray beam of a high-brilliance synchrotron source by photoemission spectroscopy and micro-photoluminescence. Two contrasting processes are at play during the irradiation. The degradation of the material manifests with the formation of Pb0 metallic clusters, loss of gaseous Br2 , decrease and shift of the photoluminescence emission. The recovery of the photoluminescence signal for prolonged beam exposure times is ascribed to self-healing of FAPbBr3 , thanks to the re-oxidation of Pb0 and migration of FA+ and Br- ions. This scenario is validated on FAPbBr3 films treated by Ar+ ion sputtering. The degradation/self-healing effect, which is previously reported for irradiation up to the ultraviolet regime, has the potential of extending the lifetime of X-ray detectors based on perovskites.
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Affiliation(s)
- Valeria Milotti
- Istituto di Struttura della Materia - CNR (ISM-CNR), Trieste, I-34149, Italy
| | - Stefania Cacovich
- Institut Photovoltaïque d'Île de France (IPVF), CNRS, Ecole Polytechnique, IP Paris, Palaiseau, 91120, France
| | - Davide Raffaele Ceratti
- Institut Photovoltaïque d'Île de France (IPVF), CNRS, Ecole Polytechnique, IP Paris, Palaiseau, 91120, France
- Sorbonne Université, CNRS, Collège de France, UMR 7574, Chimie de la Matière Condensée de Paris, Paris, 75005, France
| | - Daniel Ory
- Institut Photovoltaïque d'Île-de-France (IPVF), 18 Boulevard Thomas Gobert, Palaiseau, 91120, France
- Électricité de France (EDF), R&D, 18 Boulevard Thomas Gobert, Palaiseau, 91120, France
| | - Jessica Barichello
- CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome "Tor Vergata,", Rome, 00133, Italy
| | - Fabio Matteocci
- CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome "Tor Vergata,", Rome, 00133, Italy
| | - Aldo Di Carlo
- CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome "Tor Vergata,", Rome, 00133, Italy
- Istituto di Struttura della Materia - CNR (ISM-CNR), Rome, 00133, Italy
| | | | - Philip Schulz
- Institut Photovoltaïque d'Île de France (IPVF), CNRS, Ecole Polytechnique, IP Paris, Palaiseau, 91120, France
| | - Paolo Moras
- Istituto di Struttura della Materia - CNR (ISM-CNR), Trieste, I-34149, Italy
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10
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Sheverdyaeva PM, Hogan C, Bihlmayer G, Fujii J, Vobornik I, Jugovac M, Kundu AK, Gardonio S, Benher ZR, Santo GD, Gonzalez S, Petaccia L, Carbone C, Moras P. Giant and Tunable Out-of-Plane Spin Polarization of Topological Antimonene. Nano Lett 2023; 23:6277-6283. [PMID: 37459226 PMCID: PMC10375579 DOI: 10.1021/acs.nanolett.3c00153] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Topological insulators are bulk insulators with metallic and fully spin-polarized surface states displaying Dirac-like band dispersion. Due to spin-momentum locking, these topological surface states (TSSs) have a predominant in-plane spin polarization in the bulk fundamental gap. Here, we show by spin-resolved photoemission spectroscopy that the TSS of a topological insulator interfaced with an antimonene bilayer exhibits nearly full out-of-plane spin polarization within the substrate gap. We connect this phenomenon to a symmetry-protected band crossing of the spin-polarized surface states. The nearly full out-of-plane spin polarization of the TSS occurs along a continuous path in the energy-momentum space, and the spin polarization within the gap can be reversibly tuned from nearly full out-of-plane to nearly full in-plane by electron doping. These findings pave the way to advanced spintronics applications that exploit the giant out-of-plane spin polarization of TSSs.
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Affiliation(s)
- Polina M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Conor Hogan
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via del Fosso del Cavaliere 100, 00133 Roma, Italy
- Dipartimento di Fisica, Università di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy
| | - Gustav Bihlmayer
- Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany
| | - Jun Fujii
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Ivana Vobornik
- Istituto Officina dei Materiali (IOM)-CNR, Laboratorio TASC, Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Matteo Jugovac
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149 Trieste, Italy
- Peter Grünberg Institut PGI, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Asish K Kundu
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149 Trieste, Italy
- International Center for Theoretical Physics (ICTP), Trieste, 34151, Italy
| | - Sandra Gardonio
- Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, Ajdovščina 5270, Slovenia
| | - Zipporah Rini Benher
- Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, Ajdovščina 5270, Slovenia
| | - Giovanni Di Santo
- Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Sara Gonzalez
- Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Luca Petaccia
- Elettra - Sincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Carlo Carbone
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149 Trieste, Italy
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), Strada Statale 14 km 163.5, 34149 Trieste, Italy
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11
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Salagre E, Segovia P, González-Barrio MÁ, Jugovac M, Moras P, Pis I, Bondino F, Pearson J, Wang RS, Takeuchi I, Fuller EJ, Talin AA, Mascaraque A, Michel EG. Physical Delithiation of Epitaxial LiCoO 2 Battery Cathodes as a Platform for Surface Electronic Structure Investigation. ACS Appl Mater Interfaces 2023. [PMID: 37466037 PMCID: PMC10401565 DOI: 10.1021/acsami.3c06147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
We report a novel delithiation process for epitaxial thin films of LiCoO2(001) cathodes using only physical methods, based on ion sputtering and annealing cycles. Preferential Li sputtering followed by annealing produces a surface layer with a Li molar fraction in the range 0.5 < x < 1, characterized by good crystalline quality. This delithiation procedure allows the unambiguous identification of the effects of Li extraction without chemical byproducts and experimental complications caused by electrolyte interaction with the LiCoO2 surface. An analysis by X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) provides a detailed description of the delithiation process and the role of O and Co atoms in charge compensation. We observe the simultaneous formation of Co4+ ions and of holes localized near O atoms upon Li removal, while the surface shows a (2 × 1) reconstruction. The delithiation method described here can be applied to other crystalline battery elements and provide information on their properties that is otherwise difficult to obtain.
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Affiliation(s)
- Elena Salagre
- Dto. Física Materia Condensada, Univ. Autónoma de Madrid, 28049 Madrid, Spain
| | - Pilar Segovia
- Dto. Física Materia Condensada, Univ. Autónoma de Madrid, 28049 Madrid, Spain
- IFIMAC (Condensed Matter Physics Center), Univ. Autónoma de Madrid, 28049 Madrid, Spain
| | | | - Matteo Jugovac
- Istituto di Struttura della Materia-CNR (ISM-CNR), Trieste 34149, Italy
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), Trieste 34149, Italy
| | - Igor Pis
- IOM CNR Laboratorio TASC, AREA Science Park, Trieste 34149, Italy
| | - Federica Bondino
- IOM CNR Laboratorio TASC, AREA Science Park, Trieste 34149, Italy
| | - Justin Pearson
- Materials Science and Engineering, Univ. of Maryland, College Park, Maryland 20742, United States
| | - Richmond Shiwei Wang
- Materials Science and Engineering, Univ. of Maryland, College Park, Maryland 20742, United States
| | - Ichiro Takeuchi
- Materials Science and Engineering, Univ. of Maryland, College Park, Maryland 20742, United States
| | - Elliot J Fuller
- Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States
| | - Alec A Talin
- Sandia National Laboratories, 7011 East Avenue, Livermore, California 94550, United States
| | - Arantzazu Mascaraque
- Dto. Física de Materiales, Fac. Ciencias Físicas, Univ. Complutense de Madrid, 28040 Madrid, Spain
| | - Enrique G Michel
- Dto. Física Materia Condensada, Univ. Autónoma de Madrid, 28049 Madrid, Spain
- IFIMAC (Condensed Matter Physics Center), Univ. Autónoma de Madrid, 28049 Madrid, Spain
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12
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Caruso T, De Luca O, Melfi N, Policicchio A, Pisarra M, Godbert N, Aiello I, Giorno E, Pacilè D, Moras P, Martín F, Rudolf P, Agostino RG, Papagno M. Nearly-freestanding supramolecular assembly with tunable structural properties. Sci Rep 2023; 13:2068. [PMID: 36740719 PMCID: PMC9899781 DOI: 10.1038/s41598-023-28865-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 01/25/2023] [Indexed: 02/07/2023] Open
Abstract
The synthesis and design of two-dimensional supramolecular assemblies with specific functionalities is one of the principal goals of the emerging field of molecule-based electronics, which is relevant for many technological applications. Although a large number of molecular assemblies have been already investigated, engineering uniform and highly ordered two-dimensional molecular assemblies is still a challenge. Here we report on a novel approach to prepare wide highly crystalline molecular assemblies with tunable structural properties. We make use of the high-reactivity of the carboxylic acid functional moiety and of the predictable structural features of non-polar alkane chains to synthesize 2D supramolecular assemblies of 4-(decyloxy)benzoic acid (4DBA;C[Formula: see text]H[Formula: see text]O[Formula: see text]) on a Au(111) surface. By means of scanning tunneling microscopy, density functional theory calculations and photoemission spectroscopy, we demonstrate that these molecules form a self-limited highly ordered and defect-free two-dimensional single-layer film of micrometer-size, which exhibits a nearly-freestanding character. We prove that by changing the length of the alkoxy chain it is possible to modify in a controlled way the molecular density of the "floating" overlayer without affecting the molecular assembly. This system is especially suitable for engineering molecular assemblies because it represents one of the few 2D molecular arrays with specific functionality where the structural properties can be tuned in a controlled way, while preserving the molecular pattern.
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Affiliation(s)
- Tommaso Caruso
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy ,grid.7778.f0000 0004 1937 0319Laboratorio di Spettroscopia Avanzata dei Materiali, STAR IR, Via Tito Flavio, Università della Calabria, 87036 Rende (CS), Italy
| | - Oreste De Luca
- grid.7778.f0000 0004 1937 0319Laboratorio di Spettroscopia Avanzata dei Materiali, STAR IR, Via Tito Flavio, Università della Calabria, 87036 Rende (CS), Italy ,grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Nicola Melfi
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy
| | - Alfonso Policicchio
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy ,grid.7778.f0000 0004 1937 0319Laboratorio di Spettroscopia Avanzata dei Materiali, STAR IR, Via Tito Flavio, Università della Calabria, 87036 Rende (CS), Italy
| | - Michele Pisarra
- grid.6045.70000 0004 1757 5281INFN, Sezione LNF, Gruppo Collegato di Cosenza, Cubo 31C, 87036 Rende (CS), Italy ,grid.482876.70000 0004 1762 408XInstituto IMDEA Nanociencia, Calle Faraday 9, 28049 Madrid, Spain ,grid.5515.40000000119578126Departamento de Química, Universidad Autónoma de Madrid, Módulo 13, 28049, Madrid Spain
| | - Nicolas Godbert
- grid.7778.f0000 0004 1937 0319MAT_InLAB (Laboratorio di Materiali Molecolari Inorganici), Centro di Eccellenza CEMIF.CAL, LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende (CS), Italy ,grid.7778.f0000 0004 1937 0319LPM-Laboratorio Preparazione Materiali, STAR-Lab, Università della Calabria, Via Tito Flavio, 28049 Rende (CS), Italy
| | - Iolinda Aiello
- grid.7778.f0000 0004 1937 0319MAT_InLAB (Laboratorio di Materiali Molecolari Inorganici), Centro di Eccellenza CEMIF.CAL, LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende (CS), Italy ,grid.7778.f0000 0004 1937 0319LPM-Laboratorio Preparazione Materiali, STAR-Lab, Università della Calabria, Via Tito Flavio, 28049 Rende (CS), Italy ,grid.7778.f0000 0004 1937 0319CNR-Nanotec, UoS di Cosenza, Dipartimento di Fisica, Università della Calabria, 87036 Rende (CS), Italy
| | - Eugenia Giorno
- grid.7778.f0000 0004 1937 0319MAT_InLAB (Laboratorio di Materiali Molecolari Inorganici), Centro di Eccellenza CEMIF.CAL, LASCAMM CR-INSTM, Unità INSTM della Calabria, Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, 87036 Rende (CS), Italy ,grid.7778.f0000 0004 1937 0319LPM-Laboratorio Preparazione Materiali, STAR-Lab, Università della Calabria, Via Tito Flavio, 28049 Rende (CS), Italy
| | - Daniela Pacilè
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy
| | - Paolo Moras
- grid.472712.5Istituto di Struttura della Materia-CNR (ISM-CNR), 34149 Trieste, Italy
| | - Fernando Martín
- grid.482876.70000 0004 1762 408XInstituto IMDEA Nanociencia, Calle Faraday 9, 28049 Madrid, Spain ,grid.5515.40000000119578126Departamento de Química, Universidad Autónoma de Madrid, Módulo 13, 28049, Madrid Spain ,Condensed Matter Physics Center (IFIMAC), Cantoblanco, 28049 Madrid Spain
| | - Petra Rudolf
- grid.4830.f0000 0004 0407 1981Zernike Institute for Advanced Materials, University of Groningen, 9747 AG Groningen, The Netherlands
| | - Raffaele Giuseppe Agostino
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy ,grid.7778.f0000 0004 1937 0319Laboratorio di Spettroscopia Avanzata dei Materiali, STAR IR, Via Tito Flavio, Università della Calabria, 87036 Rende (CS), Italy
| | - Marco Papagno
- grid.7778.f0000 0004 1937 0319Dipartimento di Fisica, Università della Calabria, 87036 Rende (Cs), Italy ,grid.7778.f0000 0004 1937 0319Laboratorio di Spettroscopia Avanzata dei Materiali, STAR IR, Via Tito Flavio, Università della Calabria, 87036 Rende (CS), Italy
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13
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Kazim S, Mastrippolito D, Moras P, Jugovac M, Klimczuk T, Ali M, Ottaviano L, Gunnella R. Synchrotron radiation photoemission spectroscopy of the oxygen modified CrCl 3 surface. Phys Chem Chem Phys 2023; 25:3806-3814. [PMID: 36645158 DOI: 10.1039/d2cp04586a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We investigate the experimentally challenging CrCl3 surface by photon energy dependent photoemission (PE). The core and valence electrons after cleavage of a single crystal, either in a ultra-high vacuum (UHV) or in air, are studied by keeping the samples at 150 °C, aiming at confirming the atomic composition with respect to the expected bulk atomic structure. A common spectroscopic denominator revealed by data is the presence of a stable, but only partially ordered Cl-O-Cr surface. The electronic core levels (Cl 2p, Cr 2p and 3p), the latter ones of cumbersome component determination, allowed us to quantify the electron charge transfer to the Cr atom as a net result of this modification and the increased exchange interaction between metal and ligand atoms. In particular, the analysis of multiplet components by the CMT4XPS code evidenced the charge transfer to be favored, and similarly the reduced crystal field due to the established polarization field. Though it is often claimed that a significant amount of Cl and Cr atomic vacancies has to be included, such a possibility can be excluded on the basis of the sign and the importance of the shift in the binding energy of core level electrons. The present methodological approach can be of great impact to quantify the structure of ordered sub-oxide phases occurring in mono or bi-layer Cr trihalides.
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Affiliation(s)
- S Kazim
- School of Science and Technology Physics Section University of Camerino, Via Madonna delle Carceri 9, 62032 Camerino, MC, Italy.
| | - D Mastrippolito
- Dipartimento di Scienze Fisiche e Chimiche (DSFC), Università degli Studi dell'Aquila, Via Vetoio 10, 67100 L'Aquila, Italy
| | - P Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14, Km 163,5, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14, Km 163,5, 34149 Trieste, Italy
| | - T Klimczuk
- Faculty of Applied Physics and Mathematics, and Advanced Materials Centre, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland
| | - M Ali
- Dipartimento di Scienze Fisiche e Chimiche (DSFC), Università degli Studi dell'Aquila, Via Vetoio 10, 67100 L'Aquila, Italy.,Department of Physics, Division of Science and Technology, University of Education Lahore, Jauharabad Campus, Pakistan
| | - L Ottaviano
- Dipartimento di Scienze Fisiche e Chimiche (DSFC), Università degli Studi dell'Aquila, Via Vetoio 10, 67100 L'Aquila, Italy.,CNR-SPIN UoS L' Aquila, Via Vetoio 10, 67100 L'Aquila, Italy
| | - R Gunnella
- School of Science and Technology Physics Section University of Camerino, Via Madonna delle Carceri 9, 62032 Camerino, MC, Italy. .,INFN-Sez. Perugia, Via Pascoli Perugia, Italy
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14
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Ibrahim KB, Shifa TA, Moras P, Moretti E, Vomiero A. Facile Electron Transfer in Atomically Coupled Heterointerface for Accelerated Oxygen Evolution. Small 2023; 19:e2204765. [PMID: 36354170 DOI: 10.1002/smll.202204765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/13/2022] [Indexed: 06/16/2023]
Abstract
An efficient and cost-effective approach for the development of advanced catalysts has been regarded as a sustainable way for green energy utilization. The general guideline to design active and efficient catalysts for oxygen evolution reaction (OER) is to achieve high intrinsic activity and the exposure of more density of the interfacial active sites. The heterointerface is one of the most attractive ways that plays a key role in electrochemical water oxidation. Herein, atomically cluster-based heterointerface catalysts with strong metal support interaction (SMSI) between WMn2 O4 and TiO2 are designed. In this case, the WMn2 O4 nanoflakes are uniformly decorated by TiO2 particles to create electronic effect on WMn2 O4 nanoflakes as confirmed by X-ray absorption near edge fine structure. As a result, the engineered heterointerface requires an OER onset overpotential as low as 200 mV versus reversible hydrogen electrode, which is stable for up to 30 h of test. The outstanding performance and long-term durability are due to SMSI, the exposure of interfacial active sites, and accelerated reaction kinetics. To confirm the synergistic interaction between WMn2 O4 and TiO2 , and the modification of the electronic structure, high-resolution transmission electron microscopy (HR-TEM), X-ray photoemission spectroscopy (XPS), and X-ray absorption spectroscopy (XAS) are used.
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Affiliation(s)
- Kassa Belay Ibrahim
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, Venezia Mestre, 30170, Italy
| | - Tofik Ahmed Shifa
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, Venezia Mestre, 30170, Italy
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR), SS 14, Km 163.5, Trieste, 34149, Italy
| | - Elisa Moretti
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, Venezia Mestre, 30170, Italy
| | - Alberto Vomiero
- Department of Molecular Sciences and Nanosystems, Ca' Foscari University of Venice, Via Torino 155, Venezia Mestre, 30170, Italy
- Division of Materials Science, Department of Engineering Sciences and Mathematics, Luleå University of Technology, Luleå, SE-97187, Sweden
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15
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Masci M, Moras P, Di Chiara L, Pasquini L, Campanale CM, Bagolan P, Galletti L, Toscano A. SARS-CoV-2 in a Neonate with Truncus Arteriosus: Management and Surgical Correction Timing. Pediatr Cardiol 2022; 43:470-473. [PMID: 34674017 PMCID: PMC8529372 DOI: 10.1007/s00246-021-02757-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Accepted: 10/09/2021] [Indexed: 11/03/2022]
Abstract
Children seem to be less affected by SARS-CoV-2 infection. High risk categories should include patients with Congenital Heart Disease (CHD), both children and adults. We describe the case of a newborn with a postnatal diagnosis of Truncus Arteriosus (TA) type A1 without 22.q.11 deletion syndrome. Soon after birth, SARS-CoV-2 infection was transmitted by the father. Due to the onset of heart failure symptoms, diuretic therapy has been set up. For worsening of clinical conditions, inotropic support with milrinone was added. A progressive reduction of N-terminal-pro hormone BNP over the days has been observed. Fourteen days after the negativization of the nasopharyngeal swab, the patient underwent surgical repair with Cardiopulmonary Bypass (CPB). Postoperative course was not complicated and the patient was discharged in good clinical conditions. There is very little evidence suggesting the optimal timing for surgery in SARS-CoV-2 positive patients. With a lack of specific guidelines, current strategy suggests a symptom-based or a polymerase chain reaction (PCR) test-based approach. In our case it was challenging to determine COVID-19 impact on heart failure symptoms. Our case is the first describing the surgical correction of CHD in a 40 days year old patient, performed in CPB after 14 days from SARS-CoV-2 infection negativization.
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Affiliation(s)
- M Masci
- Perinatal Cardiology Unit, Department of Medical and Surgical for Fetus-Neonate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy.
| | - P Moras
- Pediatric Department, University of Tor Vergata, Rome, Italy
| | - L Di Chiara
- Pediatric Cardiac Intensive Care Unit, Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - L Pasquini
- Perinatal Cardiology Unit, Department of Medical and Surgical for Fetus-Neonate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - C M Campanale
- Perinatal Cardiology Unit, Department of Medical and Surgical for Fetus-Neonate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - P Bagolan
- Neonatal Surgery Unit, Department of Medical and Surgical for Fetus-Neonate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - L Galletti
- Pediatric Cardiac Surgery Unit, Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - A Toscano
- Perinatal Cardiology Unit, Department of Medical and Surgical for Fetus-Neonate, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
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16
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Fernandez L, Blanco-Rey M, Castrillo-Bodero R, Ilyn M, Ali K, Turco E, Corso M, Ormaza M, Gargiani P, Valbuena MA, Mugarza A, Moras P, Sheverdyaeva PM, Kundu AK, Jugovac M, Laubschat C, Ortega JE, Schiller F. Correction: Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds. Nanoscale 2021; 13:20704. [PMID: 34874396 DOI: 10.1039/d1nr90260a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Correction for 'Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds' by L. Fernandez et al., Nanoscale, 2020, 12, 22258-22267, DOI: 10.1039/D0NR04964F.
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Affiliation(s)
- L Fernandez
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Blanco-Rey
- Universidad del País Vasco UPV-EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
| | - R Castrillo-Bodero
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ilyn
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - K Ali
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - E Turco
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Corso
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ormaza
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, 08290 Cerdanyola del Vallès, Spain
| | - M A Valbuena
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- IMDEA Nanociencia, 28049 Madrid, Spain
| | - A Mugarza
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - P M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - Asish K Kundu
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - J E Ortega
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - F Schiller
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
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17
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Pazniak H, Varezhnikov AS, Kolosov DA, Plugin IA, Vito AD, Glukhova OE, Sheverdyaeva PM, Spasova M, Kaikov I, Kolesnikov EA, Moras P, Bainyashev AM, Solomatin MA, Kiselev I, Wiedwald U, Sysoev VV. 2D Molybdenum Carbide MXenes for Enhanced Selective Detection of Humidity in Air. Adv Mater 2021; 33:e2104878. [PMID: 34601739 DOI: 10.1002/adma.202104878] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 09/07/2021] [Indexed: 05/27/2023]
Abstract
2D transition metal carbides and nitrides (MXenes) open up novel opportunities in gas sensing with high sensitivity at room temperature. Herein, 2D Mo2 CTx flakes with high aspect ratio are successfully synthesized. The chemiresistive effect in a sub-µm MXene multilayer for different organic vapors and humidity at 101 -104 ppm in dry air is studied. Reasonably, the low-noise resistance signal allows the detection of H2 O down to 10 ppm. Moreover, humidity suppresses the response of Mo2 CTx to organic analytes due to the blocking of adsorption active sites. By measuring the impedance of MXene layers as a function of ac frequency in the 10-2 -106 Hz range, it is shown that operation principle of the sensor is dominated by resistance change rather than capacitance variations. The sensor transfer function allows to conclude that the Mo2 CTx chemiresistance is mainly originating from electron transport through interflake potential barriers with heights up to 0.2 eV. Density functional theory calculations, elucidating the Mo2 C surface interaction with organic analytes and H2 O, explain the experimental data as an energy shift of the density of states under the analyte's adsorption which induces increasing electrical resistance.
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Affiliation(s)
- Hanna Pazniak
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany
| | - Alexey S Varezhnikov
- Yuri Gagarin State Technical University of Saratov, Politekhnicheskaya str. 77, Saratov, 410054, Russia
| | - Dmitry A Kolosov
- Department of Physics, Saratov State University, Astrakhanskaya str. 83, Saratov, 410012, Russia
| | - Ilya A Plugin
- Yuri Gagarin State Technical University of Saratov, Politekhnicheskaya str. 77, Saratov, 410054, Russia
| | - Alessia Di Vito
- Department of Electronic Engineering, University of Rome Tor Vergata, Via Cracovia, 50, Roma, 00133, Italy
| | - Olga E Glukhova
- Department of Physics, Saratov State University, Astrakhanskaya str. 83, Saratov, 410012, Russia
- Laboratory of Biomedical Nanotechnology, I. M. Sechenov First Moscow State Medical University, Trubetskaya str. 8-2, Moscow, 119991, Russia
| | | | - Marina Spasova
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany
| | - Igor Kaikov
- Breitmeier Messtechnik GmbH, Englerstr. 27, 76275, Ettlingen, Germany
| | - Evgeny A Kolesnikov
- National University of Science & Technology (NUST) MISIS, Leninskiy Prospekt 4, Moscow, 119049, Russia
| | - Paolo Moras
- Institute of Structure of Matter (ISM-CNR), SS 14 Km, Trieste, 34149, Italy
| | - Alexey M Bainyashev
- Yuri Gagarin State Technical University of Saratov, Politekhnicheskaya str. 77, Saratov, 410054, Russia
| | - Maksim A Solomatin
- Yuri Gagarin State Technical University of Saratov, Politekhnicheskaya str. 77, Saratov, 410054, Russia
| | - Ilia Kiselev
- Breitmeier Messtechnik GmbH, Englerstr. 27, 76275, Ettlingen, Germany
| | - Ulf Wiedwald
- Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany
| | - Victor V Sysoev
- Yuri Gagarin State Technical University of Saratov, Politekhnicheskaya str. 77, Saratov, 410054, Russia
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18
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Caretta A, Laterza S, Bonanni V, Sergo R, Dri C, Cautero G, Galassi F, Zamolo M, Simoncig A, Zangrando M, Gessini A, Zilio SD, Flammini R, Moras P, Demidovich A, Danailov M, Parmigiani F, Malvestuto M. A novel free-electron laser single-pulse Wollaston polarimeter for magneto-dynamical studies. Struct Dyn 2021; 8:034304. [PMID: 34169118 PMCID: PMC8214468 DOI: 10.1063/4.0000104] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 05/26/2021] [Indexed: 06/13/2023]
Abstract
Here, we report on the conceptual design, the hardware realization, and the first experimental results of a novel and compact x-ray polarimeter capable of a single-pulse linear polarization angle detection in the extreme ultraviolet photon energy range. The polarimeter is tested by performing time resolved pump-probe experiments on a Ni80Fe20 Permalloy film at the M2,3 Ni edge at an externally seeded free-electron laser source. Comparison with similar experiments reported in the literature shows the advantages of our approach also in view of future experiments.
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Affiliation(s)
- Antonio Caretta
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | | | - Valentina Bonanni
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Rudi Sergo
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | | | - Giuseppe Cautero
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Fabio Galassi
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Matteo Zamolo
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Alberto Simoncig
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Marco Zangrando
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Alessandro Gessini
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Simone Dal Zilio
- Istituto Officina Dei Materiali-CNR, Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Roberto Flammini
- CNR-ISM, Istituto di Struttura della Materia, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy
| | - Paolo Moras
- CNR-ISM, Istituto di Struttura della Materia, Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Alexander Demidovich
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
| | - Miltcho Danailov
- Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 - km 163.5 in AREA Science Park, Basovizza, 34149 Trieste, Italy
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19
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Fernandez L, Blanco-Rey M, Castrillo-Bodero R, Ilyn M, Ali K, Turco E, Corso M, Ormaza M, Gargiani P, Valbuena MA, Mugarza A, Moras P, Sheverdyaeva PM, Kundu AK, Jugovac M, Laubschat C, Ortega JE, Schiller F. Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds. Nanoscale 2020; 12:22258-22267. [PMID: 33146198 DOI: 10.1039/d0nr04964f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
One-atom-thick rare-earth/noble metal (RE-NM) compounds are attractive materials to investigate two-dimensional magnetism, since they are easy to synthesize into a common RE-NM2 structure with high crystal perfection. Here we perform a comparative study of the GdAu2, HoAu2, and YbAu2 monolayer compounds grown on Au(111). We find the same atomic lattice quality and moiré superlattice periodicity in the three cases, but different electronic properties and magnetism. The YbAu2 monolayer reveals the characteristic electronic signatures of a mixed-valence configuration in the Yb atom. In contrast, GdAu2 and HoAu2 show the trivalent character of the rare-earth and ferromagnetic transitions below 22 K. Yet, the GdAu2 monolayer has an in-plane magnetic easy-axis, versus the out-of-plane one in HoAu2. The electronic bands of the two trivalent compounds are very similar, while the divalent YbAu2 monolayer exhibits different band features. In the latter, a strong 4f-5d hybridization is manifested in neatly resolved avoided crossings near the Fermi level. First principles theory points to a residual presence of empty 4f states, explaining the fluctuating valence of Yb in the YbAu2 monolayer.
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Affiliation(s)
- L Fernandez
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Blanco-Rey
- Universidad del País Vasco UPV-EHU, Dpto. de Polímeros y Materiales Avanzados: Física, Química y Tecnología, 20018 San Sebastián, Spain
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
| | - R Castrillo-Bodero
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ilyn
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - K Ali
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - E Turco
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Corso
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - M Ormaza
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
| | - P Gargiani
- ALBA Synchrotron Light Source, Carretera BP 1413 km 3.3, 08290 Cerdanyola del Vallès, Spain
| | - M A Valbuena
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- IMDEA Nanociencia, 28049 Madrid, Spain
| | - A Mugarza
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain
- Institució Catalana de Recerca i Estudis Avançats (ICREA), 08070 Barcelona, Spain
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - P M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - Asish K Kundu
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - M Jugovac
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
| | - C Laubschat
- Institut für Festkörper- und Materialphysik, Technische Universität Dresden, 01062 Dresden, Germany
| | - J E Ortega
- Universidad del País Vasco UPV-EHU, Dpto. Física Aplicada I, 20018 San Sebastián, Spain
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
| | - F Schiller
- Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain.
- Centro de Física de Materiales CSIC/UPV-EHU-Materials Physics Center, 20018 San Sebastián, Spain
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20
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Holtgrewe K, Mahatha SK, Sheverdyaeva PM, Moras P, Flammini R, Colonna S, Ronci F, Papagno M, Barla A, Petaccia L, Aliev ZS, Babanly MB, Chulkov EV, Sanna S, Hogan C, Carbone C. Topologization of β-antimonene on Bi 2Se 3 via proximity effects. Sci Rep 2020; 10:14619. [PMID: 32884112 PMCID: PMC7471962 DOI: 10.1038/s41598-020-71624-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 08/19/2020] [Indexed: 11/09/2022] Open
Abstract
Topological surface states usually emerge at the boundary between a topological and a conventional insulator. Their precise physical character and spatial localization depend on the complex interplay between the chemical, structural and electronic properties of the two insulators in contact. Using a lattice-matched heterointerface of single and double bilayers of β-antimonene and bismuth selenide, we perform a comprehensive experimental and theoretical study of the chiral surface states by means of microscopy and spectroscopic measurements complemented by first-principles calculations. We demonstrate that, although β-antimonene is a trivial insulator in its free-standing form, it inherits the unique symmetry-protected spin texture from the substrate via a proximity effect that induces outward migration of the topological state. This "topologization" of β-antimonene is found to be driven by the hybridization of the bands from either side of the interface.
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Affiliation(s)
- K Holtgrewe
- Institut für Theoretische Physik and Center for Materials Research (LaMa), Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392, Gießen, Germany
| | - S K Mahatha
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy.
- Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany.
| | - P M Sheverdyaeva
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy
| | - P Moras
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy
| | - R Flammini
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy
| | - S Colonna
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy
| | - F Ronci
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy
| | - M Papagno
- Dipartimento di Fisica, CS, Università Della Calabria, Via P. Bucci, 87036, Arcavacata di Rende, Italy
| | - A Barla
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy
| | - L Petaccia
- Elettra Sincrotrone Trieste, Strada Statale 14 km 163.5, 34149, Trieste, Italy
| | - Z S Aliev
- Azerbaijan State Oil and Industry University, AZ1010, Baku, Azerbaijan
| | - M B Babanly
- Institute Catalysis and Inorganic Chemistry, Azerbaijan National Academy of Science, AZ1143, Baku, Azerbaijan
| | - E V Chulkov
- Departamento de Fisica de Materiales, UPV/EHU, 20080, Donostia-San Sebastian, Basque Country, Spain
- Donostia International Physics Center (DIPC), P. de Manuel Lardizabal 4, 20018, San Sebastián, Basque Country, Spain
- Saint Petersburg State University, 198504, Saint Petersburg, Russia
- Institute of Strength Physics and Materials Science, Russian Academy of Sciences, 634021, Tomsk, Russia
| | - S Sanna
- Institut für Theoretische Physik and Center for Materials Research (LaMa), Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, 35392, Gießen, Germany
| | - C Hogan
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, Via del Fosso del Cavaliere 100, 00133, Roma, Italy
| | - C Carbone
- Istituto di Struttura Della Materia, Consiglio Nazionale Delle Ricerche, 34149, Trieste, Italy
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21
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Galeotti G, De Marchi F, Hamzehpoor E, MacLean O, Rajeswara Rao M, Chen Y, Besteiro LV, Dettmann D, Ferrari L, Frezza F, Sheverdyaeva PM, Liu R, Kundu AK, Moras P, Ebrahimi M, Gallagher MC, Rosei F, Perepichka DF, Contini G. Synthesis of mesoscale ordered two-dimensional π-conjugated polymers with semiconducting properties. Nat Mater 2020; 19:874-880. [PMID: 32424372 DOI: 10.1038/s41563-020-0682-z] [Citation(s) in RCA: 104] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Accepted: 04/14/2020] [Indexed: 05/08/2023]
Abstract
Two-dimensional materials with high charge carrier mobility and tunable band gaps have attracted intense research effort for their potential use in nanoelectronics. Two-dimensional π-conjugated polymers constitute a promising subclass because the band structure can be manipulated by varying the molecular building blocks while preserving key features such as Dirac cones and high charge mobility. The major barriers to the application of two-dimensional π-conjugated polymers have been the small domain size and high defect density attained in the syntheses explored so far. Here, we demonstrate the fabrication of mesoscale ordered two-dimensional π-conjugated polymer kagome lattices with semiconducting properties, Dirac cone structures and flat bands on Au(111). This material has been obtained by combining a rigid azatriangulene precursor and a hot dosing approach, which favours molecular diffusion and eliminates voids in the network. These results open opportunities for the synthesis of two-dimensional π-conjugated polymer Dirac cone materials and their integration into devices.
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Affiliation(s)
- G Galeotti
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
- Istituto di Struttura della Materia, CNR, Roma, Italy
- Deutsches Museum, München, Germany
| | - F De Marchi
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - E Hamzehpoor
- Department of Chemistry, McGill University, Montreal, Québec, Canada
| | - O MacLean
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
| | - M Rajeswara Rao
- Department of Chemistry, McGill University, Montreal, Québec, Canada
| | - Y Chen
- Department of Chemistry, McGill University, Montreal, Québec, Canada
| | - L V Besteiro
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, China
| | - D Dettmann
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
- Istituto di Struttura della Materia, CNR, Roma, Italy
| | - L Ferrari
- Istituto di Struttura della Materia, CNR, Roma, Italy
| | - F Frezza
- Istituto di Struttura della Materia, CNR, Roma, Italy
- Department of Physics, University of Tor Vergata, Rome, Italy
| | | | - R Liu
- Department of Physics, Lakehead University, Thunder Bay, Ontario, Canada
| | - A K Kundu
- Istituto di Struttura della Materia, CNR, Trieste, Italy
| | - P Moras
- Istituto di Struttura della Materia, CNR, Trieste, Italy
| | - M Ebrahimi
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada
- Department of Chemistry, Lakehead University, Thunder Bay, Ontario, Canada
| | - M C Gallagher
- Department of Physics, Lakehead University, Thunder Bay, Ontario, Canada.
| | - F Rosei
- Centre Energie, Matériaux et Télécommunications, Institut National de la Recherche Scientifique, Varennes, Québec, Canada.
| | - D F Perepichka
- Department of Chemistry, McGill University, Montreal, Québec, Canada.
| | - G Contini
- Istituto di Struttura della Materia, CNR, Roma, Italy.
- Department of Physics, University of Tor Vergata, Rome, Italy.
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22
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Hogan C, Holtgrewe K, Ronci F, Colonna S, Sanna S, Moras P, Sheverdyaeva PM, Mahatha S, Papagno M, Aliev ZS, Babanly M, Chulkov EV, Carbone C, Flammini R. Temperature Driven Phase Transition at the Antimonene/Bi 2Se 3 van der Waals Heterostructure. ACS Nano 2019; 13:10481-10489. [PMID: 31469534 DOI: 10.1021/acsnano.9b04377] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We report the discovery of a temperature-induced phase transition between the α and β structures of antimonene. When antimony is deposited at room temperature on bismuth selenide, it forms domains of α-antimonene having different orientations with respect to the substrate. During a mild annealing, the β phase grows and prevails over the α phase, eventually forming a single domain that perfectly matches the surface lattice structure of bismuth selenide. First-principles thermodynamics calculations of this van der Waals heterostructure explain the different temperature-dependent stability of the two phases and reveal a minimum energy transition path. Although the formation energies of freestanding α- and β-antimonene only slightly differ, the β phase is ultimately favored in the annealed heterostructure due to an increased interaction with the substrate mediated by the perfect lattice match.
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Affiliation(s)
- Conor Hogan
- Istituto di Struttura della Materia-CNR (ISM-CNR) , Via del Fosso del Cavaliere , 00133 Roma , Italy
- Dipartimento di Fisica , Università di Roma "Tor Vergata" , Via della Ricerca Scientifica 1 , 00133 Roma , Italy
| | - Kris Holtgrewe
- Institut für Theoretische Physik and Center for Materials Research , Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 16 , 35392 Gießen , Germany
| | - Fabio Ronci
- Istituto di Struttura della Materia-CNR (ISM-CNR) , Via del Fosso del Cavaliere , 00133 Roma , Italy
| | - Stefano Colonna
- Istituto di Struttura della Materia-CNR (ISM-CNR) , Via del Fosso del Cavaliere , 00133 Roma , Italy
| | - Simone Sanna
- Institut für Theoretische Physik and Center for Materials Research , Justus-Liebig-Universität Gießen , Heinrich-Buff-Ring 16 , 35392 Gießen , Germany
| | - Paolo Moras
- Istituto di Struttura della Materia-CNR (ISM-CNR) , S.S. 14, km 163.5 , I-34149 Trieste , Italy
| | - Polina M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR) , S.S. 14, km 163.5 , I-34149 Trieste , Italy
| | - Sanjoy Mahatha
- Istituto di Struttura della Materia-CNR (ISM-CNR) , S.S. 14, km 163.5 , I-34149 Trieste , Italy
| | - Marco Papagno
- Dipartimento di Fisica , Università della Calabria , Via P.Bucci , 87036 Arcavacata di Rende ( CS ), Italy
| | - Ziya S Aliev
- Azerbaijan State Oil and Industry University , AZ1010 Baku , Azerbaijan
| | - Mahammad Babanly
- Institute of Catalysis and Inorganic Chemistry , Azerbaijan National Academy of Science , AZ1143 Baku , Azerbaijan
| | - Evgeni V Chulkov
- Departamento de Física de Materiales, Facultad de Ciencias Químicas, UPV/EHU, and Centro de Física de Materiales, CFM-MPC, CSIC-UPV/EHU , Apdo. 1072, 20080 San Sebástian/Donostia , Basque Country , Spain
- Saint Petersburg State University , 198504 Saint Petersburg , Russia
- Donostia International Physics Center (DIPC) , P. de Manuel Lardizabal 4 , 20018 San Sebastián , Basque Country , Spain
| | - Carlo Carbone
- Istituto di Struttura della Materia-CNR (ISM-CNR) , S.S. 14, km 163.5 , I-34149 Trieste , Italy
| | - Roberto Flammini
- Istituto di Struttura della Materia-CNR (ISM-CNR) , Via del Fosso del Cavaliere , 00133 Roma , Italy
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23
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Sheverdyaeva PM, Hogan C, Sgarlata A, Fazi L, Fanfoni M, Persichetti L, Moras P, Balzarotti A. Electronic structure of the Ge/Si(1 0 5) hetero-interface: an ARPES and DFT study. J Phys Condens Matter 2018; 30:465502. [PMID: 30359332 DOI: 10.1088/1361-648x/aae66f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a joint experimental and theoretical study of the electronic properties of the rebonded-step reconstructed Ge/Si(1 0 5) surface which is the main strained face found on Ge/Si(0 0 1) quantum dots and is considered a prototypical model system for surface strain relaxation in heteroepitaxial growth. Using a vicinal surface as a model system for obtaining a stable single-domain film structure with large terraces and rebonded-step surface termination, we realized an extended and ordered Ge/Si planar hetero-junction suitable for direct study with angle-resolved photoemission spectroscopy. At the coverage of four Ge monolayers photoemission spectroscopy reveals the presence of 2D surface and film bands displaying energy-momentum dispersion compatible with the 5 × 4 periodicity of the system. The good agreement between experiment and first-principles electronic structure calculations confirms the validity of the rebonded-step structural model. The direct observation of surface features within 1 eV below the valence band maximum corroborates previously reported analysis of the electronic and optical behavior of the Ge/Si hetero-interface.
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Affiliation(s)
- P M Sheverdyaeva
- Istituto di Struttura della Materia-CNR (ISM-CNR), S.S. 14, km 163.5, I-34149, Trieste, Italy
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24
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Flammini R, Colonna S, Hogan C, Mahatha SK, Papagno M, Barla A, Sheverdyaeva PM, Moras P, Aliev ZS, Babanly MB, Chulkov EV, Carbone C, Ronci F. Evidence of β-antimonene at the Sb/Bi 2Se 3 interface. Nanotechnology 2018; 29:065704. [PMID: 29320369 DOI: 10.1088/1361-6528/aaa2c4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report a study of the interface between antimony and the prototypical topological insulator Bi2Se3. Scanning tunnelling microscopy measurements show the presence of ordered domains displaying a perfect lattice match with bismuth selenide. Density functional theory calculations of the most stable atomic configurations demonstrate that the ordered domains can be attributed to stacks of β-antimonene.
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Affiliation(s)
- R Flammini
- Istituto di Struttura della Materia-CNR (ISM-CNR), Via del Fosso del Cavaliere 100, I-00133 Roma, Italy
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25
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Moras P, Bihlmayer G, Vescovo E, Sheverdyaeva PM, Papagno M, Ferrari L, Carbone C. Spin-polarized confined states in Ag films on Fe(1 1 0). J Phys Condens Matter 2017; 29:495806. [PMID: 29091051 DOI: 10.1088/1361-648x/aa9760] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Spin- and angle-resolved photoemission spectroscopy of thin Ag(1 1 1) films on ferromagnetic Fe(1 1 0) shows a series of spin-polarized peaks. These features derive from Ag sp-bands, which form quantum well states and resonances due to confinement by a spin-dependent interface potential barrier. The spin-up states are broader and located at higher binding energy than the corresponding spin-down states at [Formula: see text], although the differences attenuate near the Fermi level. The spin-down states display multiple gap openings, which interrupt their parabolic-like dispersion. First-principles calculations attribute these findings to the symmetry- and spin-selective hybridization of the Ag states with the exchange-split bands of the substrate.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, 34149 Trieste, Italy
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26
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Sheverdyaeva PM, Mahatha SK, Ronci F, Colonna S, Moras P, Satta M, Flammini R. Signature of surface periodicity in the electronic structure of Si(1 1 1)-(7 × 7). J Phys Condens Matter 2017; 29:215001. [PMID: 28362270 DOI: 10.1088/1361-648x/aa6a7b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The surface electronic structure of Si(1 1 1)-[Formula: see text] has been studied by angle-resolved photo electron spectroscopy. Replicas of the S 1 surface state are found in correspondence with several [Formula: see text] unit cells in the reciprocal space. This observation resolves in a direct way the long-standing dichotomy between the structural and electronic properties of the system previously discussed on the basis of the [Formula: see text] or [Formula: see text] R30° surface models.
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Affiliation(s)
- P M Sheverdyaeva
- CNR-ISM, Istituto di Struttura della Materia, S.S. 14, km 163.5, I-34149 Trieste, Italy
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27
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Kubota Y, Murata K, Miyawaki J, Ozawa K, Onbasli MC, Shirasawa T, Feng B, Yamamoto S, Liu RY, Yamamoto S, Mahatha SK, Sheverdyaeva P, Moras P, Ross CA, Suga S, Harada Y, Wang KL, Matsuda I. Interface electronic structure at the topological insulator-ferrimagnetic insulator junction. J Phys Condens Matter 2017; 29:055002. [PMID: 27911879 DOI: 10.1088/1361-648x/29/5/055002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
An interface electron state at the junction between a three-dimensional topological insulator film, Bi2Se3, and a ferrimagnetic insulator film, Y3Fe5O12 (YIG), was investigated by measurements of angle-resolved photoelectron spectroscopy and x-ray absorption magnetic circular dichroism. The surface state of the Bi2Se3 film was directly observed and localized 3d spin states of the Fe3+ in the YIG film were confirmed. The proximity effect is likely described in terms of the exchange interaction between the localized Fe 3d electrons in the YIG film and delocalized electrons of the surface and bulk states in the Bi2Se3 film.
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Affiliation(s)
- Y Kubota
- Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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28
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Sheverdyaeva PM, Mahatha SK, Moras P, Petaccia L, Fratesi G, Onida G, Carbone C. Electronic States of Silicene Allotropes on Ag(111). ACS Nano 2017; 11:975-982. [PMID: 28032977 DOI: 10.1021/acsnano.6b07593] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Silicene, a honeycomb lattice of silicon, presents a particular case of allotropism on Ag(111). Silicene forms multiple structures with alike in-plane geometry but different out-of-plane atomic buckling and registry to the substrate. Angle-resolved photoemission and first-principles calculations show that these silicene structures, with (4×4), (√13×√13)R13.9°, and (2√3×2√3)R30° lattice periodicity, display similar electronic bands despite the structural differences. In all cases the interaction with the substrate modifies the electronic states, which significantly differ from those of free-standing silicene. Complex photoemission patterns arise from surface umklapp processes, varying according to the periodicity of the silicene allotropes.
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Affiliation(s)
- Polina M Sheverdyaeva
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy
| | - Sanjoy Kr Mahatha
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy
| | - Paolo Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy
| | - Luca Petaccia
- Elettra Sincrotrone Trieste , Strada Statale 14 km 163.5, I-34149 Trieste, Italy
| | - Guido Fratesi
- ETSF and Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, I-20133 Milano, Italy
| | - Giovanni Onida
- ETSF and Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, I-20133 Milano, Italy
| | - Carlo Carbone
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy
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29
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Crepaldi A, Zhan RR, Moser S, Sheverdyaeva PM, Carbone C, Papagno M, Moras P, Baraldi A, Grioni M. Interplay between electronic and structural properties in the Pb/Ag(1 0 0) interface. J Phys Condens Matter 2015; 27:455502. [PMID: 26490303 DOI: 10.1088/0953-8984/27/45/455502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report an investigation of the structural and electronic properties of a Pb monolayer (ML) grown on Ag(1 0 0), by combining x-ray photoelectron diffraction (XPD) and angle resolved photoelectron spectroscopy (ARPES). The Pb atoms are found to arrange in a pseudo-hexagonal adlayer commensurate to the underlying square Ag substrate, resulting in a coincidence cell with c([Formula: see text]) periodicity. The electronic structure of the Pb ML in proximity of the Fermi level consists in three p-derived bands, which show different degrees of hybridization with the substrate for their different orbital characters. In particular, we report that the p xy states disperse without forming energy gap, in contrast to previous ARPES studies of the Pb ML on different metallic substrates. We attribute the absence of energy gap to the commensurability between substrate and adlayer, resulting in a higher two-dimensionality of the Pb ML.
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Affiliation(s)
- A Crepaldi
- Elettra-Sincrotrone Trieste, SCpA, SS 14 km 163.5, 34149 Trieste, Italy. Institut de Physique de la Matière Condensée (ICPM), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland
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30
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Moras P, Sheverdyaeva PM, Pacilé D, Carbone C. Spectroscopic signatures of an ordered array of independent Ag heptamers. J Phys Condens Matter 2015; 27:305502. [PMID: 26174180 DOI: 10.1088/0953-8984/27/30/305502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A periodic network of Ag heptamers forms on the carburized W(1 1 0)-R(15 × 12) surface, upon deposition of sub-monolayer amounts of Ag. We investigate the electronic structure and dimensionality of this system by angle-resolved photoemission spectroscopy. The observation of very well-defined Ag 4d-levels confirms the highly ordered growth of size-selected Ag nano-particles on the W(1 1 0)-R(15 × 12) template. The absence of energy dispersion of these states indicates negligible coupling among the Ag heptamers, and points out the local character of the heptamer-substrate interaction. The system can be described as an array of Ag heptamers with fully confined Ag 4d-levels.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
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31
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Yamamoto S, Taguchi M, Someya T, Kubota Y, Ito S, Wadati H, Fujisawa M, Capotondi F, Pedersoli E, Manfredda M, Raimondi L, Kiskinova M, Fujii J, Moras P, Tsuyama T, Nakamura T, Kato T, Higashide T, Iwata S, Yamamoto S, Shin S, Matsuda I. Ultrafast spin-switching of a ferrimagnetic alloy at room temperature traced by resonant magneto-optical Kerr effect using a seeded free electron laser. Rev Sci Instrum 2015; 86:083901. [PMID: 26329205 DOI: 10.1063/1.4927828] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Ultrafast magnetization reversal of a ferrimagnetic metallic alloy GdFeCo was investigated by time-resolved resonant magneto-optical Kerr effect measurements using a seeded free electron laser. The GdFeCo alloy was pumped by a linearly polarized optical laser pulse, and the following temporal evolution of the magnetization of Fe in GdFeCo was element-selectively traced by a probe free electron laser pulse with a photon energy tuned to the Fe M-edge. The results have been measured using rotating analyzer ellipsometry method and confirmed magnetization switching caused by ultrafast heating.
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Affiliation(s)
- Sh Yamamoto
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - M Taguchi
- Nara Institute of Science and Technology (NAIST), Ikoma, Nara 630-0192, Japan
| | - T Someya
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Y Kubota
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - S Ito
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - H Wadati
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - M Fujisawa
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - F Capotondi
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - E Pedersoli
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - M Manfredda
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - L Raimondi
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - M Kiskinova
- Elettra-Sincrotrone Trieste, SS 14 - km 163.5, I-34149 Basovizza, Trieste, Italy
| | - J Fujii
- Laboratorio TASC, Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche, I-34012 Basovizza, Trieste, Italy
| | - P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
| | - T Tsuyama
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - T Nakamura
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - T Kato
- Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - T Higashide
- Department of Electrical Engineering and Computer Science, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - S Iwata
- Division of Integrated Research Projects, EcoTopia Science Institute, Nagoya University, Chikusa, Nagoya 464-8603, Japan
| | - S Yamamoto
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - S Shin
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - I Matsuda
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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32
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Moras P, Mentes TO, Sheverdyaeva PM, Locatelli A, Carbone C. Coexistence of multiple silicene phases in silicon grown on Ag(1 1 1). J Phys Condens Matter 2014; 26:185001. [PMID: 24727950 DOI: 10.1088/0953-8984/26/18/185001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Silicene, the silicon equivalent of graphene, is attracting increasing scientific and technological attention in view of the exploitation of its exotic electronic properties. This novel material has been theoretically predicted to exist as a free-standing layer in a low-buckled, stable form, and can be synthesized by the deposition of Si on appropriate crystalline substrates. By employing low-energy electron diffraction and microscopy, we have studied the growth of Si on Ag(1 1 1) and observed a rich variety of rotationally non-equivalent silicene structures. Our results highlight a very complex formation diagram, reflecting the coexistence of different and nearly degenerate silicene phases, whose relative abundance can be controlled by varying the Si coverage and growth temperature. At variance with other studies, we find that the formation of single-phase silicene monolayers cannot be achieved on Ag(1 1 1).
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
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33
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Stepanow S, Lodi Rizzini A, Krull C, Kavich J, Cezar JC, Yakhou-Harris F, Sheverdyaeva PM, Moras P, Carbone C, Ceballos G, Mugarza A, Gambardella P. Spin tuning of electron-doped metal-phthalocyanine layers. J Am Chem Soc 2014; 136:5451-9. [PMID: 24635343 DOI: 10.1021/ja501204q] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The spin state of organic-based magnets at interfaces is to a great extent determined by the organic environment and the nature of the spin-carrying metal center, which is further subject to modifications by the adsorbate-substrate coupling. Direct chemical doping offers an additional route for tailoring the electronic and magnetic characteristics of molecular magnets. Here we present a systematic investigation of the effects of alkali metal doping on the charge state and crystal field of 3d metal ions in Cu, Ni, Fe, and Mn phthalocyanine (Pc) monolayers adsorbed on Ag. Combined X-ray absorption spectroscopy and ligand field multiplet calculations show that Cu(II), Ni(II), and Fe(II) ions reduce to Cu(I), Ni(I), and Fe(I) upon alkali metal adsorption, whereas Mn maintains its formal oxidation state. The strength of the crystal field at the Ni, Fe, and Mn sites is strongly reduced upon doping. The combined effect of these changes is that the magnetic moment of high- and low-spin ions such as Cu and Ni can be entirely turned off or on, respectively, whereas the magnetic configuration of MnPc can be changed from intermediate (3/2) to high (5/2) spin. In the case of FePc a 10-fold increase of the orbital magnetic moment accompanies charge transfer and a transition to a high-spin state.
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Affiliation(s)
- Sebastian Stepanow
- Department of Materials, ETH Zürich , Hönggerbergring 64, 8093 Zürich, Switzerland
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34
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Papagno M, Pacilé D, Topwal D, Moras P, Sheverdyaeva PM, Natterer FD, Lehnert A, Rusponi S, Dubout Q, Calleja F, Frantzeskakis E, Pons S, Fujii J, Vobornik I, Grioni M, Carbone C, Brune H. Two distinct phases of bilayer graphene films on Ru(0001). ACS Nano 2012; 6:9299-9304. [PMID: 23020302 DOI: 10.1021/nn303821w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
By combining angle-resolved photoemission spectroscopy and scanning tunneling microscopy we reveal the structural and electronic properties of multilayer graphene on Ru(0001). We prove that large ethylene exposure allows the synthesis of two distinct phases of bilayer graphene with different properties. The first phase has Bernal AB stacking with respect to the first graphene layer and displays weak vertical interaction and electron doping. The long-range ordered moiré pattern modulates the crystal potential and induces replicas of the Dirac cone and minigaps. The second phase has an AA stacking sequence with respect to the first layer and displays weak structural and electronic modulation and p-doping. The linearly dispersing Dirac state reveals the nearly freestanding character of this novel second-layer phase.
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Affiliation(s)
- Marco Papagno
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy.
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35
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Moras P, Sheverdyaeva PM, Carbone C, Topwal D, Ferrari L, Bihlmayer G, Ouazi S, Rusponi S, Lehnert A, Brune H. Electronic states of moiré modulated Cu films. J Phys Condens Matter 2012; 24:335502. [PMID: 22813539 DOI: 10.1088/0953-8984/24/33/335502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We examined by low-energy electron diffraction and scanning tunneling microscopy the surface of thin Cu films on Pt(111). The Cu/Pt lattice mismatch induces a moiré modulation for films from 3 to about 10 ML thickness. We used angle-resolved photoemission spectroscopy to examine the effects of this structural modulation on the electronic states of the system. A series of hexagonal- and trigonal-like constant energy contours is found in the proximity of the Cu(111) zone boundaries. These electronic patterns are generated by Cu sp-quantum well state replicas, originating from multiple points of the reciprocal lattice associated with the moiré superstructure. Layer-dependent strain relaxation and hybridization with the substrate bands concur to determine the dispersion and energy position of the Cu Shockley surface state.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy.
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36
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Ogawa M, Gray A, Sheverdyaeva PM, Moras P, Hong H, Huang LC, Tang SJ, Kobayashi K, Carbone C, Chiang TC, Matsuda I. Controlling the topology of Fermi surfaces in metal nanofilms. Phys Rev Lett 2012; 109:026802. [PMID: 23030193 DOI: 10.1103/physrevlett.109.026802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Indexed: 06/01/2023]
Abstract
The properties of metal crystals are governed by the electrons of the highest occupied states at the Fermi level and determined by Fermi surfaces, the Fermi energy contours in momentum space. Topological regulation of the Fermi surface has been an important issue in synthesizing functional materials, which we found to be realized at room temperature in nanometer-thick films. Reducing the thickness of a metal thin film down to its electron wavelength scale induces the quantum size effect and the electronic system changes from three to two-dimensional, transforming the Fermi surface topology. Such an ultrathin film further changes its topology through one-dimensional (1D) structural deformation of the film when it is grown on a 1D substrate. In particular, when the interface has 1D metallic bands, the system is additionally stabilized by forming an electron energy gap by hybridization between 1D states of the film and substrate.
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Affiliation(s)
- M Ogawa
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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37
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Ogawa M, Sheverdyaeva PM, Moras P, Topwal D, Harasawa A, Kobayashi K, Carbone C, Matsuda I. Electronic structure study of ultrathin Ag(111) films modified by a Si(111) substrate and √3 × √3-Ag2Bi surface. J Phys Condens Matter 2012; 24:115501. [PMID: 22353647 DOI: 10.1088/0953-8984/24/11/115501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Angle-resolved photoemission spectroscopy experiments show that the electronic structure of a Ag(111) film grown on Si(111) is markedly perturbed by the formation of a √3 × √3-Ag(2)Bi Rashba-type surface alloy. Four spin-split surface states, with different band dispersions and energy contours, intercept and hybridize selectively with the sp-derived quantum well states of the Ag layer. Detailed two-dimensional band mapping of the system was carried out and constant energy contours at different energies result in hexagonal-, star- and flower-like distortions of the quantum well states as a result of various interactions. Further wavy-like modulations of the electronic structure of the film are found to originate from umklapp reflections of the Ag film states according to the surface periodicity.
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Affiliation(s)
- M Ogawa
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan.
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38
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Papagno M, Rusponi S, Sheverdyaeva PM, Vlaic S, Etzkorn M, Pacilé D, Moras P, Carbone C, Brune H. Large band gap opening between graphene Dirac cones induced by Na adsorption onto an Ir superlattice. ACS Nano 2012; 6:199-204. [PMID: 22136502 DOI: 10.1021/nn203841q] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We investigate the effects of Na adsorption on the electronic structure of bare and Ir cluster superlattice-covered epitaxial graphene on Ir(111) using angle-resolved photoemission spectroscopy and scanning tunneling microscopy. At Na saturation coverage, a massive charge migration from sodium atoms to graphene raises the graphene Fermi level by ~1.4 eV relative to its neutrality point. We find that Na is adsorbed on top of the graphene layer, and when coadsorbed onto an Ir cluster superlattice, it results in the opening of a large band gap of Δ(Na/Ir/G) = 740 meV, comparable to the one of Ge and with preserved high group velocity of the charge carriers.
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Affiliation(s)
- Marco Papagno
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy.
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39
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Wang Y, Fabris S, White TW, Pagliuca F, Moras P, Papagno M, Topwal D, Sheverdyaeva P, Carbone C, Lingenfelder M, Classen T, Kern K, Costantini G. Varying molecular interactions by coverage in supramolecular surface chemistry. Chem Commun (Camb) 2011; 48:534-6. [PMID: 22073390 DOI: 10.1039/c1cc14497a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The possibility of modifying the intermolecular interactions of absorbed benzene-carboxylic acids from coordination to hydrogen bonding by changing their surface coverage is demonstrated through a combination of scanning tunnelling microscopy, X-ray photoemission spectroscopy and density functional theory calculations.
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Affiliation(s)
- Yeliang Wang
- Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D -70569 Stuttgart, Germany
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40
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Rusponi S, Papagno M, Moras P, Vlaic S, Etzkorn M, Sheverdyaeva PM, Pacilé D, Brune H, Carbone C. Highly anisotropic Dirac cones in epitaxial graphene modulated by an island superlattice. Phys Rev Lett 2010; 105:246803. [PMID: 21231546 DOI: 10.1103/physrevlett.105.246803] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Revised: 10/13/2010] [Indexed: 05/30/2023]
Abstract
We present a new method to engineer the charge carrier mobility and its directional asymmetry in epitaxial graphene by using metal cluster superlattices self-assembled onto the moiré pattern formed by graphene on Ir(111). Angle-resolved photoemission spectroscopy reveals threefold symmetry in the band structure associated with strong renormalization of the electron group velocity close to the Dirac point giving rise to highly anisotropic Dirac cones. We further find that the cluster superlattice also affects the spectral-weight distribution of the carbon bands as well as the electronic gaps between graphene states.
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Affiliation(s)
- S Rusponi
- Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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41
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He K, Takeichi Y, Ogawa M, Okuda T, Moras P, Topwal D, Harasawa A, Hirahara T, Carbone C, Kakizaki A, Matsuda I. Direct spectroscopic evidence of spin-dependent hybridization between Rashba-split surface states and quantum-well states. Phys Rev Lett 2010; 104:156805. [PMID: 20482008 DOI: 10.1103/physrevlett.104.156805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Indexed: 05/29/2023]
Abstract
The electronic structure of ultrathin Ag(111) films covered with a square root(3) x square root(3)-Bi/Ag ordered alloy was investigated by means of spin- and angle-resolved photoemission spectroscopy. Surface-state (SS) bands, spin split by the Rashba interaction, selectively couple to the quantum-well state (QWS) bands, originally spin degenerate, in the metal film. Gaps are found to open between QWS and SS with parallel spins, while free-electron-like QWS dispersions are observed for antiparallel spin configurations. The present results demonstrate that in a nonmagnetic metal film the spin degeneracy of the valence levels can be lifted by hybridization with Rashba-type SS bands.
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Affiliation(s)
- Ke He
- Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Chiba 277-8581, Japan
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42
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Carbone C, Veronese M, Moras P, Gardonio S, Grazioli C, Zhou PH, Rader O, Varykhalov A, Krull C, Balashov T, Mugarza A, Gambardella P, Lebègue S, Eriksson O, Katsnelson MI, Lichtenstein AI. Correlated electrons step by step: itinerant-to-localized transition of fe impurities in free-electron metal hosts. Phys Rev Lett 2010; 104:117601. [PMID: 20366500 DOI: 10.1103/physrevlett.104.117601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Indexed: 05/29/2023]
Abstract
High-resolution photoemission spectroscopy and ab initio calculations have been employed to analyze the onset and progression of d-sp hybridization in Fe impurities deposited on alkali metal films. The interplay between delocalization, mediated by the free-electron environment, and Coulomb interaction among d electrons gives rise to complex electronic configurations. The multiplet structure of a single Fe atom evolves and gradually dissolves into a quasiparticle peak near the Fermi level with increasing host electron density. The effective multiorbital impurity problem within the exact diagonalization scheme describes the whole range of hybridizations.
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Affiliation(s)
- C Carbone
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, I-34012 Trieste, Italy
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43
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Moras P, Carbone C. Quantum well band formation in Ag films on InSb(111). J Phys Condens Matter 2009; 21:355502. [PMID: 21828637 DOI: 10.1088/0953-8984/21/35/355502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Room temperature deposition of Ag on InSb(111) is known to lead to three-dimensional clustering, without long-range crystalline order. We show by means of angle-resolved photoemission that 'two-step' growth in which the films are annealed to room temperature after low temperature deposition results in the formation of Ag films which are epitaxial, atomically flat, and display a quasi-discrete quantum well band structure. Core level analysis highlights different chemical interactions between the substrate and deposited materials for room temperature and 'two-step' Ag growth.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
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44
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Zhou PH, Moras P, Ferrari L, Bihlmayer G, Blügel S, Carbone C. One-dimensional 3d electronic bands of monatomic Cu chains. Phys Rev Lett 2008; 101:036807. [PMID: 18764278 DOI: 10.1103/physrevlett.101.036807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2008] [Indexed: 05/26/2023]
Abstract
The electronic structure of an array of monatomic Cu chains grown on the Pt(997) surface has been examined by angle-resolved photoemission. The monatomic wires exhibit properties associated with 3d electron confinement in one dimension. Along the wire direction, the 3d bands states display a dispersive character, with periodicity in reciprocal space defined by the wire array geometry. These observations are compared and analyzed with ab initio calculations based on the full-potential linearized augmented plane-wave method.
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Affiliation(s)
- P H Zhou
- International Center for Theoretical Physics, Trieste, Italy
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45
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Crotti C, Farnetti E, Filipuzzi S, Stener M, Zangrando E, Moras P. Evaluation of the donor ability of phenanthrolines in iridium complexes by means of synchrotron radiation photoemission spectroscopy and DFT calculations. Dalton Trans 2007:133-42. [PMID: 17160183 DOI: 10.1039/b613837c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synchrotron radiation XPS measurements of Ir 4f, N 1s and I 4d core levels for the compounds Ir(cod)(N-N)X (cod=1,5-cyclooctadiene; N-N=1,10-phenanthroline and substituted derivatives; X=Cl, I) are reported. The compounds Ir(cod)(3,4,7,8-Me4phen)X (3,4,7,8-Me4phen=3,4,7,8-tetramethyl-1,10-phenanthroline) were structurally characterized by single crystal X-ray analyses. The comparison among the binding energies shows differences that are interpreted in terms of electron density variations due to the change of the phenanthroline substituents. Such analysis provides a quantitative evaluation of the ligand donor properties. The trend in the measured binding energies is confirmed by the results obtained by DFT DeltaSCF calculations, which include final state relaxation effects, while the specific role of initial state effects has been assessed in terms of the Kohn-Sham eigenvalues analysis.
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Affiliation(s)
- Corrado Crotti
- CNR-Istituto Struttura della Materia, Unità staccata di Trieste, S.S.14, Km 163.5, 34012, Basovizza, Trieste, Italy.
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46
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Moras P, Ferrari L, Spezzani C, Gardonio S, Lezaić M, Mavropoulos P, Blügel S, Carbone C. Probing quasiparticle states bound by disparate periodic potentials. Phys Rev Lett 2006; 97:206802. [PMID: 17155702 DOI: 10.1103/physrevlett.97.206802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Indexed: 05/12/2023]
Abstract
Thin films of Ag(111) with two-dimensional crystallinity of large lateral coherence grow on Ge(111), free of in-plane registry with the underlying substrate. Ag s-p electrons forming two-dimensional quantum well states scatter coherently at the buried interface potential, resulting in an unexpected set of new quasiparticle states, as observed by angle-resolved photoemission. These new features originate from interactions among Ag quantum well bands, gaining a momentum equivalent to a reciprocal vector of the substrate lattice.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
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47
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Moras P, Theis W, Ferrari L, Gardonio S, Fujii J, Horn K, Carbone C. Quasicrystalline electronic states of a one-dimensionally modulated Ag film. Phys Rev Lett 2006; 96:156401. [PMID: 16712176 DOI: 10.1103/physrevlett.96.156401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2005] [Indexed: 05/09/2023]
Abstract
Ag films on GaAs(110) exhibit a one-dimensional quasiperiodic modulation, resulting in a Fibonacci sequence of parallel stripes with two different widths. Valence level photoemission shows that the Ag electronic states acquire a unique character along the quasiperiodic direction, distinctively manifested by a hierarchy of energy level replicas and avoided crossings at characteristic intervals in reciprocal space. These observations demonstrate the strong influence of the one-dimensional quasiperiodic potential on the Ag film states.
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Affiliation(s)
- P Moras
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche, Trieste, Italy
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48
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Varykhalov A, Shikin AM, Gudat W, Moras P, Grazioli C, Carbone C, Rader O. Probing the ground state electronic structure of a correlated electron system by quantum well states: Ag/Ni(111). Phys Rev Lett 2005; 95:247601. [PMID: 16384423 DOI: 10.1103/physrevlett.95.247601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2005] [Indexed: 05/05/2023]
Abstract
The ground state electronic properties of the strongly correlated transition metal Ni are usually not accessible from the excitation spectra measured in photoelectron spectroscopy. We show that the bottom of the Ni d band along [111] can be probed through the energy dependence of the phase of quantum-well states in Ag/Ni(111). Our model description of the quantum-well energies measured by angle-resolved photoemission determines the bottom of the empty set 1 d band of Ni as 2.6 eV, in full agreement with standard local density theory and at variance with the values of 1.7-1.8 eV from direct angle-resolved photoemission experiments of Ni.
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Affiliation(s)
- A Varykhalov
- BESSY, Albert-Einstein-Strasse 15, D-12489 Berlin, Germany
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49
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Perilongo G, Moras P, Carollo C, Battistella A, Clementi M, Laverda A, Murgia A. Spontaneous partial regression of low-grade glioma in children with neurofibromatosis-1: a real possibility. J Child Neurol 1999; 14:352-6. [PMID: 10385841 DOI: 10.1177/088307389901400602] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
At the age of 41 and 31 months, respectively, a boy and a girl affected by neurofibromatosis-1 were diagnosed with a visual pathway glioma during surveillance contrast-enhanced head magnetic resonance imaging (MRI). In the first child, the initial MRI showed that the entire optic chiasm, the intracranial tract of the left optic nerve, and hypothalamus were grossly enlarged and enhanced in the post-gadolinium T1-weighted images. Ten months later, the hypothalamic component of the lesion had regressed markedly and there were no more areas of contrast enhancement. In the second child, the initial MRI showed that the optic chiasm, the right optic tract, and geniculate body were enlarged and enhanced after gadolinium injection. At 6-month follow-up, the MRI showed that the right optic tract and the anterior aspect of the optic chiasm decreased in size and the contrast enhancement of the entire lesion was reduced dramatically. These findings, as indicated by other similar reports, confirm that spontaneous regression of visual pathway glioma is a rare but real possibility in children with neurofibromatosis-1. Therefore, clinicians need to be aware of visual pathway glioma's erratic behavior in children with neurofibromatosis-1 with special attention given to the importance of a very conservative attitude toward any type of treatment for such patients.
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Affiliation(s)
- G Perilongo
- Hematology-Oncology Division, Padua University Hospital, Pediatric Neuro-Oncology Program, Italy.
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50
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Bernard JG, Moras P. [Pathogenicity of Staphylococcus and Infectious Endocarditis]. Presse Med (1893) 1956; 64:2120. [PMID: 13400807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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