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Qiu G, Yang HY, Chong SK, Cheng Y, Tai L, Wang KL. Manipulating Topological Phases in Magnetic Topological Insulators. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2655. [PMID: 37836296 PMCID: PMC10574534 DOI: 10.3390/nano13192655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 09/21/2023] [Accepted: 09/25/2023] [Indexed: 10/15/2023]
Abstract
Magnetic topological insulators (MTIs) are a group of materials that feature topological band structures with concurrent magnetism, which can offer new opportunities for technological advancements in various applications, such as spintronics and quantum computing. The combination of topology and magnetism introduces a rich spectrum of topological phases in MTIs, which can be controllably manipulated by tuning material parameters such as doping profiles, interfacial proximity effect, or external conditions such as pressure and electric field. In this paper, we first review the mainstream MTI material platforms where the quantum anomalous Hall effect can be achieved, along with other exotic topological phases in MTIs. We then focus on highlighting recent developments in modulating topological properties in MTI with finite-size limit, pressure, electric field, and magnetic proximity effect. The manipulation of topological phases in MTIs provides an exciting avenue for advancing both fundamental research and practical applications. As this field continues to develop, further investigations into the interplay between topology and magnetism in MTIs will undoubtedly pave the way for innovative breakthroughs in the fundamental understanding of topological physics as well as practical applications.
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Affiliation(s)
- Gang Qiu
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
- Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA
| | - Hung-Yu Yang
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
| | - Su Kong Chong
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
- Beijing Academy of Quantum Information Sciences, Beijing 100193, China
| | - Yang Cheng
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
| | - Lixuan Tai
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
| | - Kang L. Wang
- Department of Electrical and Computer Engineering, University of California, Los Angeles, CA 90095, USA; (H.-Y.Y.); (S.K.C.); (Y.C.); (L.T.)
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de Bragança RH, Croitoru MD, Shanenko AA, Aguiar JA. Effect of Material-Dependent Boundaries on the Interference Induced Enhancement of the Surface Superconductivity Temperature. J Phys Chem Lett 2023:5657-5664. [PMID: 37311195 DOI: 10.1021/acs.jpclett.3c00835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Using the tight-binding Bogoliubov-de Gennes formalism, we describe the influence of the surface potential on the superconducting critical temperature at the surface. Surface details are taken into account within the framework of the self-consistent Lang-Kohn effective potential. The regimes of strong and weak coupling of superconducting correlations are considered. Our study reveals that, although the enhancement of the surface critical temperature, originating from the enhancement of the localized correlation due to the constructive interference between quasiparticle bulk orbits, can be sufficiently affected by the surface potential, this influence, nonetheless, strongly depends on the bulk material parameters, such as the effective electron density parameter and Fermi energy, and is likely to be negligible for some materials, in particular for narrow-band metals. Thus, superconducting properties of a surface can be controlled by the surface/interface potential properties, which offer an additional tuning knob for the superconducting state at the surface/interface.
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Affiliation(s)
- R H de Bragança
- Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Av. Prof. Aníbal Fernandes, s/n, 50670-901, Recife-PE, Brazil
| | - M D Croitoru
- Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Av. Prof. Aníbal Fernandes, s/n, 50670-901, Recife-PE, Brazil
- HSE University, 101000, Moscow, Russia
| | | | - J Albino Aguiar
- Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Av. Prof. Aníbal Fernandes, s/n, 50670-901, Recife-PE, Brazil
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Mazzola F, Zhang Y, Olszowska N, Rosmus M, D’Olimpio G, Istrate MC, Politano GG, Vobornik I, Sankar R, Ghica C, Gao J, Politano A. Fermiology of Chiral Cadmium Diarsenide CdAs 2, a Candidate for Hosting Kramers-Weyl Fermions. J Phys Chem Lett 2023; 14:3120-3125. [PMID: 36952263 PMCID: PMC10084463 DOI: 10.1021/acs.jpclett.3c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 03/20/2023] [Indexed: 06/18/2023]
Abstract
Nonmagnetic chiral crystals are a new class of systems hosting Kramers-Weyl Fermions, arising from the combination of structural chirality, spin-orbit coupling (SOC), and time-reversal symmetry. These materials exhibit nontrivial Fermi surfaces with SOC-induced Chern gaps over a wide energy range, leading to exotic transport and optical properties. In this study, we investigate the electronic structure and transport properties of CdAs2, a newly reported chiral material. We use synchrotron-based angle-resolved photoelectron spectroscopy (ARPES) and density functional theory (DFT) to determine the Fermiology of the (110)-terminated CdAs2 crystal. Our results, together with complementary magnetotransport measurements, suggest that CdAs2 is a promising candidate for novel topological properties protected by the structural chirality of the system. Our work sheds light on the details of the Fermi surface and topology for this chiral quantum material, providing useful information for engineering novel spintronic and optical devices based on quantized chiral charges, negative longitudinal magnetoresistance, and nontrivial Chern numbers.
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Affiliation(s)
- Federico Mazzola
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area
Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
- Department
of Molecular Sciences and Nanosystems, Ca’
Foscari University of Venice, I-30172 Venice, Italy
| | - Yanxue Zhang
- Key
Laboratory of Materials Modification by Laser, Ion and Electron Beams,
Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Natalia Olszowska
- National
Synchrotron Radiation Centre SOLARIS, Jagiellonian
University, Czerwone Maki 98, PL-30392 Kraków, Poland
| | - Marcin Rosmus
- National
Synchrotron Radiation Centre SOLARIS, Jagiellonian
University, Czerwone Maki 98, PL-30392 Kraków, Poland
| | - Gianluca D’Olimpio
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via
Vetoio, I-67100 L’Aquila (AQ), Italy
| | | | - Grazia Giuseppina Politano
- Department
of Information Engineering, Infrastructures and Sustainable Energy
(DIIES), University “Mediterranea”
of Reggio Calabria, Loc. Feo di Vito, I-89122 Reggio Calabria, Italy
| | - Ivana Vobornik
- Istituto
Officina dei Materiali (IOM)−CNR, Laboratorio TASC, Area
Science Park, S.S.14, km 163.5, I-34149 Trieste, Italy
| | - Raman Sankar
- Institute
of Physics, Academia Sinica Nankang, Taipei 11529, Taiwan
| | - Corneliu Ghica
- National
Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
| | - Junfeng Gao
- Key
Laboratory of Materials Modification by Laser, Ion and Electron Beams,
Ministry of Education, School of Physics, Dalian University of Technology, Dalian 116024, China
| | - Antonio Politano
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via
Vetoio, I-67100 L’Aquila (AQ), Italy
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Boukhvalov D, D’Olimpio G, Mazzola F, Kuo CN, Mardanya S, Fujii J, Politano GG, Lue CS, Agarwal A, Vobornik I, Torelli P, Politano A. Unveiling the Catalytic Potential of Topological Nodal-Line Semimetal AuSn 4 for Hydrogen Evolution and CO 2 Reduction. J Phys Chem Lett 2023; 14:3069-3076. [PMID: 36947176 PMCID: PMC10068825 DOI: 10.1021/acs.jpclett.3c00113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Accepted: 03/16/2023] [Indexed: 06/18/2023]
Abstract
In recent years, the correlation between the existence of topological electronic states in materials and their catalytic activity has gained increasing attention, due to the exceptional electron conductivity and charge carrier mobility exhibited by quantum materials. However, the physicochemical mechanisms ruling catalysis with quantum materials are not fully understood. Here, we investigate the chemical reactivity, ambient stability, and catalytic activity of the topological nodal-line semimetal AuSn4. Our findings reveal that the surface of AuSn4 is prone to oxidation, resulting in the formation of a nanometric SnO2 skin. This surface oxidation significantly enhances the material's performance as a catalyst for the hydrogen evolution reaction in acidic environments. We demonstrate that the peculiar atomic structure of oxidized AuSn4 enables the migration of hydrogen atoms through the Sn-O layer with a minimal energy barrier of only 0.19 eV. Furthermore, the Volmer step becomes exothermic in the presence of Sn vacancies or tin-oxide skin, as opposed to being hindered in the pristine sample, with energy values of -0.62 and -1.66 eV, respectively, compared to the +0.46 eV energy barrier in the pristine sample. Our model also suggests that oxidized AuSn4 can serve as a catalyst for the hydrogen evolution reaction in alkali media. Additionally, we evaluate the material's suitability for the carbon dioxide reduction reaction, finding that the presence of topologically protected electronic states enhances the migration of hydrogen atoms adsorbed on the catalyst to carbon dioxide.
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Affiliation(s)
- Danil
W. Boukhvalov
- College
of Science, Institute of Materials Physics and Chemistry, Nanjing Forestry University, Nanjing 210037, P. R. China
- Institute
of Physics and Technology, Ural Federal
University, Mira Str.
19, 620002 Yekaterinburg, Russia
| | - Gianluca D’Olimpio
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
| | - Federico Mazzola
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Chia-Nung Kuo
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Sougata Mardanya
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Jun Fujii
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Grazia Giuseppina Politano
- Department
of Information Engineering, Infrastructures and Sustainable Energy
(DIIES), University “Mediterranea”
of Reggio Calabria, Loc. Feo di Vito, 89122 Reggio Calabria, Italy
| | - Chin Shan Lue
- Department
of Physics, National Cheng Kung University, 1 Ta-Hsueh Road, 70101 Tainan, Taiwan
| | - Amit Agarwal
- Department
of Physics, Indian Institute of Technology
Kanpur, Kanpur 208016, India
| | - Ivana Vobornik
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Piero Torelli
- Consiglio
Nazionale delle Ricerche (CNR), Istituto Officina dei Materiali (IOM), Laboratorio
TASC, Area Science Park
S.S. 14 km 163.5, 34149 Trieste, Italy
| | - Antonio Politano
- Department
of Physical and Chemical Sciences, University
of L’Aquila, via Vetoio, 67100 L’Aquila (AQ), Italy
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