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Macis S, Mosesso L, D'Arco A, Perucchi A, Di Pietro P, Lupi S. Anisotropic Optical Response of Ti-Doped VO 2 Single Crystals. MATERIALS (BASEL, SWITZERLAND) 2024; 17:3121. [PMID: 38998204 PMCID: PMC11242553 DOI: 10.3390/ma17133121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 06/17/2024] [Accepted: 06/19/2024] [Indexed: 07/14/2024]
Abstract
This study delves into the effects of titanium (Ti) doping on the optical properties of vanadium dioxide (VO2), a material well known for its metal-to-insulator transition (MIT) near room temperature. By incorporating Ti into VO2's crystal lattice, we aim to uncover the resultant changes in its physical properties, crucial for enhancing its application in smart devices. Utilizing polarized infrared micro-spectroscopy, we examined TixV1-xO2 single crystals with varying Ti concentrations (x = 0.059, x = 0.082, and x = 0.187) across different crystal phases (the conductive rutile phase and insulating monoclinic phases M1 and M2) from the far-infrared to the visible spectral range. Our findings reveal that Ti doping significantly influences the phononic spectra, introducing absorption peaks not attributed to pure VO2 or TiO2. This is especially notable with polarization along the crystal growth axis, mainly in the x = 0.187 sample. Furthermore, we demonstrate that the electronic contribution to optical conductivity in the metallic phase exhibits strong anisotropy, higher along the c axis than the a-b plane. This anisotropy, coupled with the progressive broadening of the zone center infrared active phonon modes with increasing doping, highlights the complex interplay between structural and electronic dynamics in doped VO2. Our results underscore the potential of Ti doping in fine-tuning VO2's electronic and thermochromic properties, paving the way for its enhanced application in optoelectronic devices and technologies.
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Affiliation(s)
- Salvatore Macis
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Lorenzo Mosesso
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Annalisa D'Arco
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy
| | - Andrea Perucchi
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km163.5 in AREA Science Park, 34012 Trieste, Italy
| | - Paola Di Pietro
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km163.5 in AREA Science Park, 34012 Trieste, Italy
| | - Stefano Lupi
- Department of Physics, Sapienza University, Piazzale Aldo Moro 5, 00185 Rome, Italy
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km163.5 in AREA Science Park, 34012 Trieste, Italy
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2
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Blankenship BW, Li R, Guo R, Zhao N, Shin J, Yang R, Ko SH, Wu J, Rho Y, Grigoropoulos C. Photothermally Activated Artificial Neuromorphic Synapses. NANO LETTERS 2023; 23:9020-9025. [PMID: 37724920 DOI: 10.1021/acs.nanolett.3c02681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
Biological nervous systems rely on the coordination of billions of neurons with complex, dynamic connectivity to enable the ability to process information and form memories. In turn, artificial intelligence and neuromorphic computing platforms have sought to mimic biological cognition through software-based neural networks and hardware demonstrations utilizing memristive circuitry with fixed dynamics. To incorporate the advantages of tunable dynamic software implementations of neural networks into hardware, we develop a proof-of-concept artificial synapse with adaptable resistivity. This synapse leverages the photothermally induced local phase transition of VO2 thin films by temporally modulated laser pulses. Such a process quickly modifies the conductivity of the film site-selectively by a factor of 500 to "activate" these neurons and store "memory" by applying varying bias voltages to induce self-sustained Joule heating between electrodes after activation with a laser. These synapses are demonstrated to undergo a complete heating and cooling cycle in less than 120 ns.
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Affiliation(s)
- Brian W Blankenship
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
| | - Runxuan Li
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
| | - Ruihan Guo
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
| | - Naichen Zhao
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
| | - Jaeho Shin
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
| | - Rundi Yang
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
| | - Seung Hwan Ko
- Applied Nano and Thermal Science Lab, Department of Mechanical Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
| | - Junqiao Wu
- Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
| | - Yoonsoo Rho
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
- Physical & Life Sciences and NIF & Photon Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, United States
| | - Costas Grigoropoulos
- Laser Thermal Laboratory, Department of Mechanical Engineering, University of California, Berkeley, California 94720, United States
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Santos AJ, Martin N, Jiménez JJ, Alcántara R, Margueron S, Casas-Acuña A, García R, Morales FM. Facile Fabrication of High-Performance Thermochromic VO 2-Based Films on Si for Application in Phase-Change Devices. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2023; 35:4435-4448. [PMID: 37332680 PMCID: PMC10268973 DOI: 10.1021/acs.chemmater.3c00613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 05/15/2023] [Indexed: 06/20/2023]
Abstract
This work reports on an alternative and advantageous procedure to attain VO2-based thermochromic coatings on silicon substrates. It involves the sputtering of vanadium thin films at glancing angles and their subsequent fast annealing in an air atmosphere. By adjusting thickness and porosity of films as well as the thermal treatment parameters, high VO2(M) yields were achieved for 100, 200, and 300 nm thick layers treated at 475 and 550 °C for reaction times below 120 s. Comprehensive structural and compositional characterization by Raman spectroscopy, X-ray diffraction, and scanning-transmission electron microscopies combined with analytical techniques such as electron energy-loss spectroscopy bring to the fore the successful synthesis of VO2(M) + V2O3/V6O13/V2O5 mixtures. Likewise, a 200 nm thick coating consisting exclusively of VO2(M) is also achieved. Conversely, the functional characterization of these samples is addressed by variable temperature spectral reflectance and resistivity measurements. The best results are obtained for the VO2/Si sample with changes in reflectance of 30-65% in the near-infrared at temperatures between 25 and 110 °C. Similarly, it is also proven that the achieved mixtures of vanadium oxides can be advantageous for certain optical applications in specific infrared windows. Finally, the features of the different structural, optical, and electrical hysteresis loops associated with the metal-insulator transition of the VO2/Si sample are disclosed and compared. These remarkable thermochromic performances hereby accomplished highlight the suitability of these VO2-based coatings for applications in a wide range of optical, optoelectronic, and/or electronic smart devices.
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Affiliation(s)
- Antonio J. Santos
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Materials Science and Metallurgic Engineering, and Inorganic Chemistry,
Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
- Université
de Franche-Comté, CNRS, Institut FEMTO-ST, Besançon F-25000, France
| | - Nicolas Martin
- Université
de Franche-Comté, CNRS, Institut FEMTO-ST, Besançon F-25000, France
| | - Juan J. Jiménez
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Materials Science and Metallurgic Engineering, and Inorganic Chemistry,
Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
| | - Rodrigo Alcántara
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Physical Chemistry, Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
| | - Samuel Margueron
- Université
de Franche-Comté, CNRS, Institut FEMTO-ST, Besançon F-25000, France
| | - Andrea Casas-Acuña
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Materials Science and Metallurgic Engineering, and Inorganic Chemistry,
Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
| | - Rafael García
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Materials Science and Metallurgic Engineering, and Inorganic Chemistry,
Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
| | - Francisco M. Morales
- IMEYMAT:
Institute of Research on Electron Microscopy and Materials of the
University of Cádiz, Puerto
Real E-11510, Spain
- Department
of Materials Science and Metallurgic Engineering, and Inorganic Chemistry,
Faculty of Sciences, University of Cádiz, Puerto Real E-11510, Spain
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Hu P, Hu P, Vu TD, Li M, Wang S, Ke Y, Zeng X, Mai L, Long Y. Vanadium Oxide: Phase Diagrams, Structures, Synthesis, and Applications. Chem Rev 2023; 123:4353-4415. [PMID: 36972332 PMCID: PMC10141335 DOI: 10.1021/acs.chemrev.2c00546] [Citation(s) in RCA: 27] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
Vanadium oxides with multioxidation states and various crystalline structures offer unique electrical, optical, optoelectronic and magnetic properties, which could be manipulated for various applications. For the past 30 years, significant efforts have been made to study the fundamental science and explore the potential for vanadium oxide materials in ion batteries, water splitting, smart windows, supercapacitors, sensors, and so on. This review focuses on the most recent progress in synthesis methods and applications of some thermodynamically stable and metastable vanadium oxides, including but not limited to V2O3, V3O5, VO2, V3O7, V2O5, V2O2, V6O13, and V4O9. We begin with a tutorial on the phase diagram of the V-O system. The second part is a detailed review covering the crystal structure, the synthesis protocols, and the applications of each vanadium oxide, especially in batteries, catalysts, smart windows, and supercapacitors. We conclude with a brief perspective on how material and device improvements can address current deficiencies. This comprehensive review could accelerate the development of novel vanadium oxide structures in related applications.
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Di Pietro P, Golalikhani M, Wijesekara K, Chaluvadi SK, Orgiani P, Xi X, Lupi S, Perucchi A. Spectroscopic Evidence of a Dimensionality-Induced Metal-to-Insulator Transition in the Ruddlesden-Popper La n+1Ni nO 3n+1 Series. ACS APPLIED MATERIALS & INTERFACES 2021; 13:6813-6819. [PMID: 33497183 PMCID: PMC7883343 DOI: 10.1021/acsami.0c19577] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 01/15/2021] [Indexed: 06/01/2023]
Abstract
Perovskite-based heterostructures have recently gained remarkable interest, thanks to atomic-scale precision engineering. These systems are very susceptible to small variations of control parameters, such as two-dimensionality, strain, lattice polarizability, and doping. Focusing on the rare-earth nickelate diagram, LaNiO3 (LNO) catches the eye, being the only nickelate that does not undergo a metal-to-insulator transition (MIT). Therefore, the ground state of LNO has been studied in several theoretical and experimental papers. Here, we show by means of infrared spectroscopy that an MIT can be driven by dimensionality control in ultrathin LNO films when the number of unit cells drops to 2. Such a dimensionality tuning can eventually be tailored when a physically implemented monolayer in the ultrathin films is replaced by a digital single layer embedded in the Ruddlesden-Popper Lan+1NinO3n+1 series. We provide spectroscopic evidence that the dimensionality-induced MIT in Ruddlesden-Popper nickelates strongly resembles that of ultrathin LNO films. Our results can pave the way to the employment of Ruddlesden-Popper Lan+1NinO3n+1 to tune the electronic properties of LNO through dimensional transition without the need of physically changing the number of unit cells in thin films.
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Affiliation(s)
- Paola Di Pietro
- Elettra
- Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Trieste, Italy
| | - Maryam Golalikhani
- Physics
Department, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Kanishka Wijesekara
- Physics
Department, Temple University, Philadelphia, Pennsylvania 19122, United States
| | | | - Pasquale Orgiani
- CNR-IOM
TASC Laboratory, 34149 Trieste, Italy
- CNR-SPIN, UOS Salerno, Fisciano, 84084 Salerno, Italy
| | - Xiaoxing Xi
- Physics
Department, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Stefano Lupi
- CNR-IOM
and Dipartimento di Fisica, Università
di Roma Sapienza, 00185 Roma, Italy
| | - Andrea Perucchi
- Elettra
- Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in Area Science Park, 34149 Trieste, Italy
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Overcoming the thermal regime for the electric-field driven Mott transition in vanadium sesquioxide. Nat Commun 2019; 10:1159. [PMID: 30858368 PMCID: PMC6411733 DOI: 10.1038/s41467-019-09137-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 02/13/2019] [Indexed: 11/28/2022] Open
Abstract
The complex interplay among electronic, magnetic and lattice degrees of freedom in Mott-Hubbard materials leads to different types of insulator-to-metal transitions (IMT) which can be triggered by temperature, pressure, light irradiation and electric field. However, several questions remain open concerning the quantum or thermal nature of electric field-driven transition process. Here, using intense terahertz pulses, we reveal the emergence of an instantaneous purely-electronic IMT in the Mott-Hubbard vanadium sequioxide (V2O3) prototype material. While fast electronics allow thermal-driven transition involving Joule heating, which takes place after tens of picoseconds, terahertz electric field is able to induce a sub-picosecond electronic switching. We provide a comprehensive study of the THz induced Mott transition, showing a crossover from a fast quantum dynamics to a slower thermal dissipative evolution for increasing temperature. Strong-field terahertz-driven electronic transition paves the way to ultrafast electronic switches and high-harmonic generation in correlated systems. Thermal effects limit the speed of the electrically driven insulator-metal transition in V2O3 to tens of picoseconds. Here the authors show that under an intense THz-electric-field excitation the thermal regime can be overcome, achieving a purely electronic transition on ultrafast timescales.
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7
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Borinaga M, Ibañez-Azpiroz J, Bergara A, Errea I. Strong Electron-Phonon and Band Structure Effects in the Optical Properties of High Pressure Metallic Hydrogen. PHYSICAL REVIEW LETTERS 2018; 120:057402. [PMID: 29481166 DOI: 10.1103/physrevlett.120.057402] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2017] [Indexed: 06/08/2023]
Abstract
The recent claim of having produced metallic hydrogen in the laboratory relies on measurements of optical spectra. Here, we present first-principles calculations of the reflectivity of hydrogen between 400 and 600 GPa in the I4_{1}/amd crystal structure, the one predicted at these pressures, based on both time-dependent density functional and Eliashberg theories, thus, covering the optical properties from the infrared to the ultraviolet regimes. Our results show that atomic hydrogen displays an interband plasmon at around 6 eV that abruptly suppresses the reflectivity, while the large superconducting gap energy yields a sharp decrease of the reflectivity in the infrared region approximately at 120 meV. The experimentally estimated electronic scattering rates in the 0.7-3 eV range are in agreement with our theoretical estimations, which show that the huge electron-phonon interaction of the system dominates the electronic scattering in this energy range. The remarkable features in the optical spectra predicted here encourage extending the optical measurements to the infrared and ultraviolet regions as our results suggest optical measurements can potentially identify high-pressure phases of hydrogen.
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Affiliation(s)
- Miguel Borinaga
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Manuel Lardizabal Pasealekua 5, 20018 Donostia/San Sebastián, Basque Country, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal Pasealekua 4, 20018 Donostia/San Sebastián, Basque Country, Spain
| | - Julen Ibañez-Azpiroz
- Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany
| | - Aitor Bergara
- Centro de Física de Materiales CFM, CSIC-UPV/EHU, Manuel Lardizabal Pasealekua 5, 20018 Donostia/San Sebastián, Basque Country, Spain
- Donostia International Physics Center (DIPC), Manuel Lardizabal Pasealekua 4, 20018 Donostia/San Sebastián, Basque Country, Spain
- Departamento de Física de la Materia Condensada, University of the Basque Country (UPV/EHU), 48080 Bilbao, Basque Country, Spain
| | - Ion Errea
- Donostia International Physics Center (DIPC), Manuel Lardizabal Pasealekua 4, 20018 Donostia/San Sebastián, Basque Country, Spain
- Fisika Aplikatua 1 Saila, Bilboko Ingeniaritza Eskola, University of the Basque Country (UPV/EHU), Rafael Moreno "Pitxitxi" Pasealekua 3, 48013 Bilbao, Basque Country, Spain
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Capitani F, Langerome B, Brubach JB, Roy P, Drozdov A, Eremets M, Nicol EJ, Carbotte JP, Timusk T. Spectroscopic evidence of a new energy scale for superconductivity in H 3S. NATURE PHYSICS 2017; 13:859-863. [PMID: 28883888 PMCID: PMC5584662 DOI: 10.1038/nphys4156] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 04/28/2017] [Indexed: 05/31/2023]
Abstract
The discovery of a superconducting phase in sulfur hydride under high pressure with a critical temperature above 200 K has provided fresh impetus to the search for superconductors at ever higher temperatures. Although this systems displays all the hallmarks of superconductivity, the mechanism through which it arises remains to be determined. Here we provide a first optical spectroscopy study of this superconductor. Experimental results for the optical reflectivity of H3S, under hydrostatic pressure of 150 GPa, for several temperatures and over the range 60 to 600 meV of photon energies, are compared with theoretical calculations based on Eliashberg theory. Two significant features stand out: some remarkably strong infrared active phonons at around 160 meV, and a band with a depressed reflectance in the superconducting state in the region from 450 meV to 600 meV. In this energy range H3S becomes more reflecting with increasing temperature, a change that is traced to superconductivity originating from the electron-phonon interaction. The shape, magnitude, and energy dependence of this band at 150 K agrees with our calculations. This provides strong evidence of a conventional mechanism. However, the unusually strong optical phonon suggests a contribution of electronic degrees of freedom.
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Affiliation(s)
- F. Capitani
- Synchrotron SOLEIL, AILES Beamline, Saint-Aubin, 91190, France
| | - B. Langerome
- Synchrotron SOLEIL, AILES Beamline, Saint-Aubin, 91190, France
| | - J.-B. Brubach
- Synchrotron SOLEIL, AILES Beamline, Saint-Aubin, 91190, France
| | - P. Roy
- Synchrotron SOLEIL, AILES Beamline, Saint-Aubin, 91190, France
| | - A. Drozdov
- Biogeochemistry Department, Max Planck Institute for Chemistry, PO Box 3060, 55020 Mainz, Germany
| | - M.I. Eremets
- Biogeochemistry Department, Max Planck Institute for Chemistry, PO Box 3060, 55020 Mainz, Germany
| | - E. J. Nicol
- Department of Physics, University of Guelph, Guelph, ON N1G 2W1, Canada
| | - J. P. Carbotte
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
- The Canadian Institute for Advanced Research, Toronto, ON M5G 1Z8, Canada
| | - T. Timusk
- Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada
- The Canadian Institute for Advanced Research, Toronto, ON M5G 1Z8, Canada
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Lo Vecchio I, Baldassarre L, Di Pietro P, Giorgianni F, Marsi M, Perucchi A, Schade U, Lanzara A, Lupi S. Orbital dependent coherence temperature and optical anisotropy of V 2O 3 quasiparticles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:345602. [PMID: 28665290 DOI: 10.1088/1361-648x/aa7cd7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on an orbital and temperature dependent study of the onset of coherent quasiparticles in V2O3 single crystal. By using polarized infrared spectroscopy we demonstrate that the electronic coherence temperature is strongly orbital dependent, being about 400 K for [Formula: see text] orbitals and 500 K for the [Formula: see text]. This suggests that V2O3 low energy electrodynamics can be described in terms of two electron liquids differently renormalized by electronic correlations.
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Affiliation(s)
- I Lo Vecchio
- Dipartimento di Fisica, 'Sapienza' Università di Roma, Piazzale A. Moro 2, I-00185 Roma, Italy. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States of America
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Kumar S, Maury F, Bahlawane N. Electrical Switching in Semiconductor-Metal Self-Assembled VO 2 Disordered Metamaterial Coatings. Sci Rep 2016; 6:37699. [PMID: 27883052 PMCID: PMC5121613 DOI: 10.1038/srep37699] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/01/2016] [Indexed: 11/21/2022] Open
Abstract
As a strongly correlated metal oxide, VO2 inspires several highly technological applications. The challenging reliable wafer-scale synthesis of high quality polycrystalline VO2 coatings is demonstrated on 4” Si taking advantage of the oxidative sintering of chemically vapor deposited VO2 films. This approach results in films with a semiconductor-metal transition (SMT) quality approaching that of the epitaxial counterpart. SMT occurs with an abrupt electrical resistivity change exceeding three orders of magnitude with a narrow hysteresis width. Spatially resolved infrared and Raman analyses evidence the self-assembly of VO2 disordered metamaterial, compresing monoclinic (M1 and M2) and rutile (R) domains, at the transition temperature region. The M2 mediation of the M1-R transition is spatially confined and related to the localized strain-stabilization of the M2 phase. The presence of the M2 phase is supposed to play a role as a minor semiconducting phase far above the SMT temperature. In terms of application, we show that the VO2 disordered self-assembly of M and R phases is highly stable and can be thermally triggered with high precision using short heating or cooling pulses with adjusted strengths. Such a control enables an accurate and tunable thermal control of the electrical switching.
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Affiliation(s)
- Sunil Kumar
- Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux L-4362 Esch-sur-Alzette Luxembourg
| | - Francis Maury
- CIRIMAT, ENSIACET-4 allée E. Monso, 31030 Toulouse, France
| | - Naoufal Bahlawane
- Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux L-4362 Esch-sur-Alzette Luxembourg
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11
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Wang X, Gong Z, Dong K, Lou S, Slack J, Anders A, Yao J. Tunable Bragg filters with a phase transition material defect layer. OPTICS EXPRESS 2016; 24:20365-20372. [PMID: 27607643 DOI: 10.1364/oe.24.020365] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose an all-solid-state tunable Bragg filter with a phase transition material as the defect layer. Bragg filters based on a vanadium dioxide defect layer sandwiched between silicon dioxide/titanium dioxide Bragg gratings are experimentally demonstrated. Temperature dependent reflection spectroscopy shows the dynamic tunability and hysteresis properties of the Bragg filter. Temperature dependent Raman spectroscopy reveals the connection between the tunability and the phase transition of the vanadium dioxide defect layer. This work paves a new avenue in tunable Bragg filter designs and promises more applications by combining phase transition materials and optical cavities.
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12
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Tailoring of Highly Intense THz Radiation Through High Brightness Electron Beams Longitudinal Manipulation. APPLIED SCIENCES-BASEL 2016. [DOI: 10.3390/app6020056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Tran MK, Levallois J, Akrap A, Teyssier J, Kuzmenko AB, Lévy-Bertrand F, Tediosi R, Brandt M, Lerch P, van der Marel D. Versatile setup for optical spectroscopy under high pressure and low temperature. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2015; 86:105102. [PMID: 26520979 DOI: 10.1063/1.4931990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present an optical setup for spectroscopic measurements in the infrared and of Raman shift under high pressure and at low temperature. Using a membrane-driven diamond anvil cell, the pressure can be tuned in situ up to 20 GPa and the temperatures ranges from room temperature down to 18 K in transmission mode and 13 K in reflection mode. In transmission, the setup is entirely working under vacuum to reduce the water absorption features and obtain a higher spectral stability. Since the infrared throughput obtained with a thermal source is limited, the use of a synchrotron source allowed to enhance the performance, as illustrated with results obtained with various materials. The analysis of the reflectivity is adapted so that it benefits from ambient pressure data and produces quantitative optical conductivity curves that can be easily compared to the results at ambient pressure.
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Affiliation(s)
- Michaël K Tran
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Julien Levallois
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Ana Akrap
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Jérémie Teyssier
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Alexey B Kuzmenko
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Florence Lévy-Bertrand
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Riccardo Tediosi
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Mehdi Brandt
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
| | - Philippe Lerch
- Infrared Beamline, Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland
| | - Dirk van der Marel
- Département de Physique de la Matière Quantique, Université de Genève, Quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland
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14
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Guo Y, Clark SJ, Robertson J. Calculation of metallic and insulating phases of V2O3 by hybrid density functionals. J Chem Phys 2014; 140:054702. [DOI: 10.1063/1.4863325] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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15
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Peng WW, Niu G, Tétot R, Vilquin B, Raimondi F, Brubach JB, Amzallag E, Yanagida T, Autier-Laurent S, Lecoeur P, Roy P. Insulator-metal transition of VO₂ ultrathin films on silicon: evidence for an electronic origin by infrared spectroscopy. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:445402. [PMID: 24121423 DOI: 10.1088/0953-8984/25/44/445402] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report on the first simultaneous observations of both electronic and structural temperature-induced insulator-to-metal transition (IMT) in VO2 ultrathin films, made possible by the use of broad range transmission infrared spectroscopy. Thanks to these techniques, the infrared phonon structures, as well as the appearance of the free carrier signature, were resolved for the first time. The temperature-resolved spectra allowed the determination of the temperature hysteresis for both the structural (monoclinic-to-rutile) and electronic (insulator-to-metallic) transitions. The combination of these new observations and DFT simulations for the monoclinic structure allows us to verify the direct transition from monoclinic (M1) to rutile and exclude an intermediate structural monoclinic form (M2). The delay in structural modification compared to the primer electronic transition (325 K compared to 304 K) supports the role of free charges as the transition driving force. The shape of the free charge hysteresis suggests that the primer electronic transition occurs first at 304 K, followed by both its propagation to the heart of the layer and the structural transition when T increases. This study outlines further the potential of VO2 ultrathin films integrated on silicon for optoelectronics and microelectronics.
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Affiliation(s)
- W W Peng
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
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16
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Vecchio IL, Perucchi A, Di Pietro P, Limaj O, Schade U, Sun Y, Arai M, Yamaura K, Lupi S. Infrared evidence of a Slater metal-insulator transition in NaOsO₃. Sci Rep 2013; 3:2990. [PMID: 24141899 PMCID: PMC3801134 DOI: 10.1038/srep02990] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Accepted: 09/20/2013] [Indexed: 11/09/2022] Open
Abstract
The magnetically driven metal-insulator transition (MIT) was predicted by Slater in the fifties. Here a long-range antiferromagnetic (AF) order can open up a gap at the Brillouin electronic band boundary regardless of the Coulomb repulsion magnitude. However, while many low-dimensional organic conductors display evidence for an AF driven MIT, in three-dimensional (3D) systems the Slater MIT still remains elusive. We employ terahertz and infrared spectroscopy to investigate the MIT in the NaOsO₃ 3D antiferromagnet. From the optical conductivity analysis we find evidence for a continuous opening of the energy gap, whose temperature dependence can be well described in terms of a second order phase transition. The comparison between the experimental Drude spectral weight and the one calculated through Local Density Approximation (LDA) shows that electronic correlations play a limited role in the MIT. All the experimental evidence demonstrates that NaOsO₃ is the first known 3D Slater insulator.
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Affiliation(s)
- I Lo Vecchio
- Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 2, I-00185 Roma, Italy
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17
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Ta Phuoc V, Vaju C, Corraze B, Sopracase R, Perucchi A, Marini C, Postorino P, Chligui M, Lupi S, Janod E, Cario L. Optical conductivity measurements of GaTa4Se8 under high pressure: evidence of a bandwidth-controlled insulator-to-metal Mott transition. PHYSICAL REVIEW LETTERS 2013; 110:037401. [PMID: 23373949 DOI: 10.1103/physrevlett.110.037401] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2012] [Indexed: 06/01/2023]
Abstract
The optical properties of a GaTa(4)Se(8) single crystal are investigated under high pressure. At ambient pressure, the optical conductivity exhibits a charge gap of ≈0.12 eV and a broad midinfrared band at ≈0.55 eV. As pressure is increased, the low energy spectral weight is strongly enhanced and the optical gap is rapidly filled, pointing to an insulator to metal transition around 6 GPa. The overall evolution of the optical conductivity demonstrates that GaTa(4)Se(8) is a Mott insulator which undergoes a bandwidth-controlled Mott metal-insulator transition under pressure, in remarkably good agreement with theory. With the use of our optical data and ab initio band structure calculations, our results were successfully compared to the (U/D, T/D) phase diagram predicted by dynamical mean field theory for strongly correlated systems.
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Affiliation(s)
- V Ta Phuoc
- GREMAN, CNRS UMR 7347-CEA, Université F. Rabelais, UFR Sciences, Tours, France
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18
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Stinghen D, Ferreira JG, Nunes GG, Soares JF. A new ring-like arrangement of vanadyl(IV) groups bridged by monodentate alkoxides: cyclo-decakis(μ-cyclohexylmethanolato)pentakis[oxidovanadium(IV)]. Acta Crystallogr C 2012; 68:m353-5. [PMID: 23221246 DOI: 10.1107/s0108270112045702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 11/05/2012] [Indexed: 11/10/2022] Open
Abstract
The pentanuclear title compound, [V(5)(C(7)H(13)O)(10)O(5)], has a metal-oxygen core that consists of five vanadyl(IV) centres bridged by the O atoms of cyclohexylmethanolate ligands. This particular ring topology is new to oxovanadium(IV) chemistry and resembles the structure proposed for [V(5)O(15)](5-) on the basis of (51)V NMR studies in aqueous solution. The bulky cyclohexylmethanolate ligands adopt chair-like conformations and project outwards from the central cyclic core. The title compound crystallizes in a centrosymmetric triclinic unit cell, which contains four independent but chemically identical molecules in the asymmetric unit. The crystal structure is devoid of any significant intermolecular interactions.
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Affiliation(s)
- Danilo Stinghen
- Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, Curitiba PR, Brazil
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Stegemann B, Klemm M, Horn S, Woydt M. Switching adhesion forces by crossing the metal-insulator transition in Magnéli-type vanadium oxide crystals. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2011; 2:59-65. [PMID: 21977416 PMCID: PMC3148054 DOI: 10.3762/bjnano.2.8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Accepted: 01/18/2011] [Indexed: 05/30/2023]
Abstract
Magnéli-type vanadium oxides form the homologous series V(n)O(2) (n) (-1) and exhibit a temperature-induced, reversible metal-insulator first order phase transition (MIT). We studied the change of the adhesion force across the transition temperature between the cleavage planes of various vanadium oxide Magnéli phases (n = 3 … 7) and spherical titanium atomic force microscope (AFM) tips by systematic force-distance measurements with a variable-temperature AFM under ultrahigh vacuum conditions (UHV). The results show, for all investigated samples, that crossing the transition temperatures leads to a distinct change of the adhesion force. Low adhesion corresponds consistently to the metallic state. Accordingly, the ability to modify the electronic structure of the vanadium Magnéli phases while maintaining composition, stoichiometry and crystallographic integrity, allows for relating frictional and electronic material properties at the nano scale. This behavior makes the vanadium Magnéli phases interesting candidates for technology, e.g., as intelligent devices or coatings where switching of adhesion or friction is desired.
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Affiliation(s)
- Bert Stegemann
- University of Applied Sciences (HTW) Berlin, Wilhelminenhofstr. 75a, D-12459 Berlin, Germany
- BAM - Federal Institute for Materials Research and Testing Berlin, Unter den Eichen 44–46, D-12203 Berlin, Germany
| | - Matthias Klemm
- University Augsburg, Universitätsstr. 1, D-86135 Augsburg, Germany
| | - Siegfried Horn
- University Augsburg, Universitätsstr. 1, D-86135 Augsburg, Germany
| | - Mathias Woydt
- BAM - Federal Institute for Materials Research and Testing Berlin, Unter den Eichen 44–46, D-12203 Berlin, Germany
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Wu C, Wei H, Ning B, Xie Y. New vanadium oxide nanostructures: controlled synthesis and their smart electrical switching properties. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:1972-1976. [PMID: 20527000 DOI: 10.1002/adma.200903890] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Control over the different polymorphs of vanadium oxide that possess electrical switching properties is advancing rapidly as a result of the need to address energy-efficiency issues; an example of which is the intelligent regulation of infrared light demonstrated by these polymorphs. Recent advances in the development of new vanadium oxide structures as well as their promising electrical switching properties are summarized here. Theoretical analysis and experimental results suggest that the presence of infinite vanadium ion chains in the crystal structure plays a decisive role in determining the electrical properties of vanadium oxides. The successful synthesis of new vanadium oxide materials and their nanostructures not only promotes a mechanistic understanding of the temperature-driven electrical switching properties but also provides the right materials for constructing smart devices that can selectively filter out infrared light.
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Affiliation(s)
- Changzheng Wu
- Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of China, Anhui, P R China
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