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Awais Rehman M, ur Rehman J, Bilal Tahir M. A DFT study of structural, electronic, optical, mechanical, thermoelectric, and magnetic properties of Pb-halide perovskites LiPbX3 (X=Cl, Br, and I) for photovoltaic applications. COMPUT THEOR CHEM 2023. [DOI: 10.1016/j.comptc.2023.114085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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Song C, Yang Q, Liu X, Zhao H, Zhang C, Meng S. Electronic Origin of Laser-Induced Ferroelectricity in SrTiO 3. J Phys Chem Lett 2023; 14:576-583. [PMID: 36633437 DOI: 10.1021/acs.jpclett.2c03078] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Although ultrafast control of the nonthermally driven ferroelectric transition of paraelectric SrTiO3 was achieved under laser excitation, the underlying mechanism and dynamics of the photoinduced phase transition remain ambiguous. Here, the determinant formation mechanism of ultrafast ferroelectricity in SrTiO3 is traced by nonadiabatic dynamics simulations. That is, the selective excitation of multiple phonons, induced by photoexcited electrons through the strong correlation between electronic excitation and lattice distortion, results in the breaking of the crystal central symmetry and the onset of ferroelectricity. The accompanying population transition between 3dz2 and 3dx2-y2 orbitals excites multiple phonon branches, including the two high-energy longitudinal optical modes, so as to drive the titanium ion away from the center of the oxygen octahedron and generate a metastable ferroelectric phase. Our findings reveal a cooperative electronic and ionic driving mechanism for the laser-induced ferroelectricity that provides new schemes for the optical control of ultrafast quantum states.
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Affiliation(s)
- Chenchen Song
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100049, China
| | - Qing Yang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
| | - Xinbao Liu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100049, China
| | - Hui Zhao
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100049, China
| | - Cui Zhang
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- Songshan Lake Materials Laboratory, Dongguan523808, China
| | - Sheng Meng
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing100049, China
- Songshan Lake Materials Laboratory, Dongguan523808, China
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Pandit A, Hamad B. Anharmonic lattice dynamics and structural phase transition of SnTe monolayer from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 51:035401. [PMID: 36327452 DOI: 10.1088/1361-648x/aca001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
In this work we investigate the role of quartic anharmonicity on the lattice- and thermo-dynamic properties of rectangular (γ) and square (β) phases of two-dimensional (2D) SnTe monolayer (ML) by using self-consistent phonon (SCP) theory, based on the first-principles calculations. For both phases, as compared to the usual harmonic approximation (HA), the renormalized phonon frequency at the optical modes (4-10) is found to be increased upon the inclusion of quartic anharmonicity via the SCP method, where the effects of cubic anharmonicity are neglected. At the experimentally observed transition temperature (Tc= 270 K), the difference in the vibrational free-energy between the square and rectangular phases of SnTe ML, calculated by using the anharmonic SCP correction is found to be much closer to the structural energy gain as compared to that obtained by using only the quasi-harmonic contribution. This validates the significance of SCP approach over the HA to explain the lattice dynamics properties and predict theTcfor SnTe ML and similar 2D compounds. The calculated lattice thermal conductivity of square SnTe ML (e.g. 10.67 W m-1K-1at 300 K) is higher than that of the rectangular SnTe ML (e.g. 6.72 W m-1K-1at 300 K) due to the relatively higher corresponding thermodynamic parameters: specific heat capacity, group velocity, and phonon lifetime obtained for the square SnTe ML. Particularly, the low energy phonon modes are found to transport most of the heat in the system and, hence, played major role to the total lattice thermal conductivity.
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Affiliation(s)
- Abhiyan Pandit
- Physics Department, University of Arkansas, Fayetteville, AR 72701, United States of America
| | - Bothina Hamad
- Physics Department, University of Arkansas, Fayetteville, AR 72701, United States of America
- Physics Department, The University of Jordan, Amman 11942, Jordan
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Gupta A, Silotia H, Kumari A, Dumen M, Goyal S, Tomar R, Wadehra N, Ayyub P, Chakraverty S. KTaO 3 -The New Kid on the Spintronics Block. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2106481. [PMID: 34961972 DOI: 10.1002/adma.202106481] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 11/16/2021] [Indexed: 06/14/2023]
Abstract
Long after the heady days of high-temperature superconductivity, the oxides came back into the limelight in 2004 with the discovery of the 2D electron gas (2DEG) in SrTiO3 (STO) and several heterostructures based on it. Not only do these materials exhibit interesting physics, but they have also opened up new vistas in oxide electronics and spintronics. However, much of the attention has recently shifted to KTaO3 (KTO), a material with all the "good" properties of STO (simple cubic structure, high mobility, etc.) but with the additional advantage of a much larger spin-orbit coupling. In this state-of-the-art review of the fascinating world of KTO, it is attempted to cover the remarkable progress made, particularly in the last five years. Certain unsolved issues are also indicated, while suggesting future research directions as well as potential applications. The range of physical phenomena associated with the 2DEG trapped at the interfaces of KTO-based heterostructures include spin polarization, superconductivity, quantum oscillations in the magnetoresistance, spin-polarized electron transport, persistent photocurrent, Rashba effect, topological Hall effect, and inverse Edelstein Effect. It is aimed to discuss, on a single platform, the various fabrication techniques, the exciting physical properties and future application possibilities of this family of materials.
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Affiliation(s)
- Anshu Gupta
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Harsha Silotia
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Anamika Kumari
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Manish Dumen
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Saveena Goyal
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Ruchi Tomar
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Neha Wadehra
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
| | - Pushan Ayyub
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Mumbai, India
| | - Suvankar Chakraverty
- Quantum Materials and Devices Unit, Institute of Nano Science and Technology, Sector-81, Mohali, Punjab, 140306, India
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Chi Y, Van Vliet KJ, Youssef M, Yildiz B. Complex Oxides under Simulated Electric Field: Determinants of Defect Polarization in ABO 3 Perovskites. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2104476. [PMID: 34894095 PMCID: PMC8811848 DOI: 10.1002/advs.202104476] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/05/2021] [Indexed: 06/14/2023]
Abstract
Polarization of ionic and electronic defects in response to high electric fields plays an essential role in determining properties of materials in applications such as memristive devices. However, isolating the polarization response of individual defects has been challenging for both models and measurements. Here the authors quantify the nonlinear dielectric response of neutral oxygen vacancies, comprised of strongly localized electrons at an oxygen vacancy site, in perovskite oxides of the form ABO3 . Their approach implements a computationally efficient local Hubbard U correction in density functional theory simulations. These calculations indicate that the electric dipole moment of this defect is correlated positively with the lattice volume, which they varied by elastic strain and by A-site cation species. In addition, the dipole of the neutral oxygen vacancy under electric field increases with increasing reducibility of the B-site cation. The predicted relationship among point defect polarization, mechanical strain, and transition metal chemistry provides insights for the properties of memristive materials and devices under high electric fields.
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Affiliation(s)
- Yen‐Ting Chi
- Department of Materials Science & EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
| | - Krystyn J. Van Vliet
- Department of Materials Science & EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
| | - Mostafa Youssef
- Department of Materials Science & EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
- Department of Mechanical EngineeringThe American University in CairoAUC Avenue, P.O. Box 74New Cairo11835Egypt
| | - Bilge Yildiz
- Department of Materials Science & EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
- Department of Nuclear Science & EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
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Zhao ZC, Goryachev M, Krupka J, Tobar ME. Precision Multi-Mode Dielectric Characterization of a Crystalline Perovskite Enables Determination of the Temperature-Dependent Phase Transitions. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:423-429. [PMID: 34437061 DOI: 10.1109/tuffc.2021.3108118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Simple perovskite crystals undergo structural phase transitions on cooling to low temperatures, which significantly change the material properties of the crystal. In this work, we rigorously characterize the temperature evolution of permittivity of a perovskite crystal as it undergoes phase transitions. In particular, we have undertaken precision measurements of a single crystal of Strontium Titanate from 294.6 to 5.6 K, by measuring the frequency of multiple microwave transverse electric (TE) and magnetic resonant modes simultaneously. The multi-mode microwave measurement technique of resonant frequency used in this work allows high precision determination of any induced anisotropy of the permittivity as the crystal undergoes structural phase transitions. Compared with previous results, we unequivocally show that the permittivity has an isotropic value of 316.3±2.2 at room temperature, consistent with its well-known cubic structure, and determine the onset of dielectric anisotropy as the crystal is cooled to lower temperatures. We show that the crystal exhibits uniaxial anisotropy in the permittivity below 105 K when the structure becomes tetragonal, and exhibits biaxial anisotropy in the permittivity below 51 K when the structure becomes orthorhombic.
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Observing a previously hidden structural-phase transition onset through heteroepitaxial cap response. Proc Natl Acad Sci U S A 2019; 116:4141-4146. [PMID: 30787195 DOI: 10.1073/pnas.1819641116] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Characterization of the onset of a phase transition is often challenging due to the fluctuations of the correlation length scales of the order parameters. This is especially true for second-order structural-phase transition due to minute changes involved in the relevant lattice constants. A classic example is the cubic-to-tetragonal second-order phase transition in SrTiO3 (STO), which is so subtle that it is still unresolved. Here, we demonstrate an approach to resolve this issue by epitaxially grown rhombohedral La0.7Sr0.3MnO3 (LSMO) thin films on the cubic STO (100) substrate. The shear strain induced nanotwinning waves in the LSMO film are extremely sensitive to the cubic-to-tetragonal structural-phase transitions of the STO substrate. Upon cooling from room temperature, the development of the nanotwinning waves is spatially inhomogeneous. Untwinned, atomically flat domains, ranging in size from 100 to 300 nm, start to appear randomly in the twinned phase between 265 and 175 K. At ∼139 K, the untwinned, atomically flat domains start to grow rapidly into micrometer scale and finally become dominant at ∼108 K. These results indicate that the low-temperature tetragonal precursor phase of STO has already nucleated at 265 K, significantly higher than the critical temperature of STO (∼105 K). Our work paves a pathway to visualize the onset stages of structural-phase transitions that are too subtle to be observed using direct-imaging methods.
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Rusevich LL, Zvejnieks G, Erba A, Dovesi R, Kotomin EA. Electromechanical Properties of Ba(1–x)SrxTiO3 Perovskite Solid Solutions from First-Principles Calculations. J Phys Chem A 2017; 121:9409-9414. [DOI: 10.1021/acs.jpca.7b08473] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leonid L. Rusevich
- Institute
of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga LV-1063, Latvia
- Institute of Physical Energetics, 11 Krivu str., Riga LV-1006, Latvia
| | - Guntars Zvejnieks
- Institute
of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga LV-1063, Latvia
| | - Alessandro Erba
- Dipartimento
di Chimica, Università degli Studi di Torino, via Giuria
5, I-10125 Torino, Italy
| | - Roberto Dovesi
- Dipartimento
di Chimica, Università degli Studi di Torino, via Giuria
5, I-10125 Torino, Italy
| | - Eugene A. Kotomin
- Institute
of Solid State Physics, University of Latvia, 8 Kengaraga str., Riga LV-1063, Latvia
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Debnath AK, Prasad R, Singh A, Samanta S, Kumar A, Bohra A, Bhattacharya D, Basu S, Joshi N, Aswal DK, Gupta SK. Interface mediated semiconducting to metallic like transition in ultrathin Bi 2Se 3 films on (100) SrTiO 3 grown by molecular beam epitaxy. RSC Adv 2015. [DOI: 10.1039/c5ra17949a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Compressive strains due to the structural phase transition of SrTiO3 substrate facilitate semiconductor to metal like transition in Bi2Se3 thin films.
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Affiliation(s)
- Anil K. Debnath
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - R. Prasad
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - Ajay Singh
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - Soumen Samanta
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - Ashwini Kumar
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - Anil Bohra
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | | | - Saibal Basu
- Solid State Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - Niraj Joshi
- Sahyadri College of Engineering and Management
- Mangalore-575007
- India
| | - Dinesh K. Aswal
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
| | - S. K. Gupta
- Technical Physics Division
- Bhabha Atomic Research Center
- Mumbai-400 085
- India
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Franchini C, Chen XQ, Podloucky R. Thickness dependent structural and electronic properties of CuO grown on SrTiO₃(100): a hybrid density functional theory study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:045004. [PMID: 21406878 DOI: 10.1088/0953-8984/23/4/045004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We discuss the structural and electronic properties of tetragonal CuO grown on SrTiO₃(100) by means of hybrid density functional theory. Our analysis explains the anomalously large Cu-O vertical distance observed in the experiments (≈2.7 Å) in terms of a peculiar frustration between two competing local Cu-O environments characterized by different in-plane and out-of-plane bond lengths and Cu electronic populations. The proper inclusion of substrate effects is crucial to understanding the tetragonal expansion and to reproduce correctly the measured valence band spectrum for a CuO thickness of 3-3.5 unit cells, in agreement with the experimentally estimated thickness.
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Affiliation(s)
- C Franchini
- University of Vienna, Faculty of Physics and Center for Computational Materials Science, Sensengasse 8/12, A-1090 Wien, Austria.
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Hong J, Catalan G, Scott JF, Artacho E. The flexoelectricity of barium and strontium titanates from first principles. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:112201. [PMID: 21389458 DOI: 10.1088/0953-8984/22/11/112201] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present ab initio calculations of the longitudinal flexoelectricity for BaTiO(3) and SrTiO(3) using a direct approach. The calculated value for SrTiO(3) agrees with recently reported measurements. For BaTiO(3), however, the theoretical values are smaller than the measured ones; possible reasons for the discrepancy are discussed.
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Affiliation(s)
- Jiawang Hong
- Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, UK
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