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Belushkin AV. Comparison of the Possibilities of Inelastic Scattering of Synchrotron Radiation and Neutrons for Studying Atomic, Molecular, and Magnetic Dynamics in Condensed Matter. CRYSTALLOGR REP+ 2022. [DOI: 10.1134/s1063774522010035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Zacharias M, Seiler H, Caruso F, Zahn D, Giustino F, Kelires PC, Ernstorfer R. Efficient First-Principles Methodology for the Calculation of the All-Phonon Inelastic Scattering in Solids. PHYSICAL REVIEW LETTERS 2021; 127:207401. [PMID: 34860053 DOI: 10.1103/physrevlett.127.207401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/09/2021] [Accepted: 09/22/2021] [Indexed: 06/13/2023]
Abstract
Inelastic scattering experiments are key methods for mapping the full dispersion of fundamental excitations of solids in the ground as well as nonequilibrium states. A quantitative analysis of inelastic scattering in terms of phonon excitations requires identifying the role of multiphonon processes. Here, we develop an efficient first-principles methodology for calculating the all-phonon quantum mechanical structure factor of solids. We demonstrate our method by obtaining excellent agreement between measurements and calculations of the diffuse scattering patterns of black phosphorus, showing that multiphonon processes play a substantial role. The present approach constitutes a step towards the interpretation of static and time-resolved electron, x-ray, and neutron inelastic scattering data.
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Affiliation(s)
- Marios Zacharias
- Department of Mechanical and Materials Science Engineering, Cyprus University of Technology, P.O. Box 50329, 3603 Limassol, Cyprus
| | - Hélène Seiler
- Fritz-Haber-Institut, Physical Chemistry Department, Berlin 14195, Germany
| | - Fabio Caruso
- Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
| | - Daniela Zahn
- Fritz-Haber-Institut, Physical Chemistry Department, Berlin 14195, Germany
| | - Feliciano Giustino
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, Texas 78712, USA
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Pantelis C Kelires
- Department of Mechanical and Materials Science Engineering, Cyprus University of Technology, P.O. Box 50329, 3603 Limassol, Cyprus
| | - Ralph Ernstorfer
- Fritz-Haber-Institut, Physical Chemistry Department, Berlin 14195, Germany
- Institut für Optik und Atomare Physik, Technische Universität Berlin, 10623 Berlin, Germany
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3
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Abstract
The coupled nonequilibrium dynamics of electrons and phonons in monolayer MoS2 is investigated by combining first-principles calculations of the electron-phonon and phonon-phonon interactions with the time-dependent Boltzmann equation. Strict phase-space constraints in the electron-phonon scattering are found to influence profoundly the decay path of excited electrons and holes, restricting the emission of phonons to crystal momenta close to a few high-symmetry points in the Brillouin zone. As a result of momentum selectivity in the phonon emission, the nonequilibrium lattice dynamics is characterized by the emergence of a highly anisotropic population of phonons in reciprocal space, which persists for up to 10 ps until thermal equilibrium is restored by phonon-phonon scattering. Achieving control of the nonequilibrium dynamics of the lattice may provide unexplored opportunities to selectively enhance the phonon population of two-dimensional crystals and, thereby, transiently tailor electron-phonon interactions over subpicosecond time scales.
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Affiliation(s)
- Fabio Caruso
- Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
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4
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Debnath R, Maity I, Biswas R, Raghunathan V, Jain M, Ghosh A. Evolution of high-frequency Raman modes and their doping dependence in twisted bilayer MoS 2. NANOSCALE 2020; 12:17272-17280. [PMID: 32400768 DOI: 10.1039/c9nr09897f] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Twisted van der Waals heterostructures provide a new platform for studying strongly correlated quantum phases. The interlayer coupling in these heterostructures is sensitive to the twist angle (θ) and key to controllably tuning several interesting properties. Here, we demonstrate the systematic evolution of the interlayer coupling strength with twist angle in bilayer MoS2 using a combination of Raman spectroscopy and classical simulations. At zero doping, we observe a monotonic increase in the separation between the A1g and E2g1 mode frequencies as θ decreases from 10°→ 1°, and the separation approaches that of a bilayer at small twist angles. Furthermore, using doping dependent Raman spectroscopy, we reveal the θ dependent softening and broadening of the A1g mode, whereas the E2g1 mode remains unaffected. Using first principles based simulations, we demonstrate large (weak) electron-phonon coupling for the A1g (E2g1) mode, which explains the experimentally observed trends. Our study provides a non-destructive way to characterize the twist angle and the interlayer coupling and establishes the manipulation of phonons in twisted bilayer MoS2 (twistnonics).
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Affiliation(s)
- Rahul Debnath
- Department of Physics, Indian Institute of Science, Bangalore 560012, India.
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5
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Novko D, Caruso F, Draxl C, Cappelluti E. Ultrafast Hot Phonon Dynamics in MgB_{2} Driven by Anisotropic Electron-Phonon Coupling. PHYSICAL REVIEW LETTERS 2020; 124:077001. [PMID: 32142321 DOI: 10.1103/physrevlett.124.077001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 10/25/2019] [Accepted: 01/28/2020] [Indexed: 06/10/2023]
Abstract
The zone-center E_{2g} modes play a crucial role in MgB_{2}, controlling the scattering mechanisms in the normal state as well the superconducting pairing. Here, we demonstrate via first-principles quantum-field theory calculations that, due to the anisotropic electron-phonon interaction, a hot-phonon regime where the E_{2g} phonons can achieve significantly larger effective populations than other modes, is triggered in MgB_{2} by the interaction with an ultrashort laser pulse. Spectral signatures of this scenario in ultrafast pump-probe Raman spectroscopy are discussed in detail, revealing also a fundamental role of nonadiabatic processes in the optical features of the E_{2g} mode.
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Affiliation(s)
- Dino Novko
- Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Bijenička 46, 10000 Zagreb, Croatia
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Fabio Caruso
- Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Claudia Draxl
- Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Emmanuele Cappelluti
- Istituto di Struttura della Materia, CNR, Division of Ultrafast Processes in Materials (FLASHit), 34149 Trieste, Italy
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6
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Yan GQ, Cheng XL, Zhang H. Kohn anomaly and van Hove singularity in IV B and V B group transition metals nitrides and carbides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:075401. [PMID: 31627192 DOI: 10.1088/1361-648x/ab4f47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The superconducting behavior in IVB-VB group transition metal nitrides and carbides has generally been associated with the phonon anomaly and Fermi surface nesting. However, the origin of phonon anomaly has remained ambiguous (i.e. longitudinal acoustic or transverse acoustic modes). We performed first-principles calculations to investigate the phononic properties of these materials and theoretically confirmed that the Kohn anomaly originates from the lower transverse acoustic mode along the ГX direction, thereby revealing the frequency derivative discontinuity of the mode. In particular, the Kohn anomaly region is found to move from the interior to the boundary X point of the Brillouin zone with increasing number of valence electrons. We deduced that the Kohn anomaly originated from the electrons of the filled energy level near the van Hove singularity. These results suggest that the screening of the ionic electric field decreases, while the coupling of conduction electrons with the highly degenerate modes between the TA∥ and LA via Umklapp scattering process increases. The Fermi surface nesting also plays a role in enhancing the superconductivity. The electronic excitation effect induces a stabilization of the V2 group transition metal nitrides.
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Affiliation(s)
- Gai-Qin Yan
- College of Physics, Sichuan University, Chengdu 610065, People's Republic of China
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7
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Huang Y, Zhou J, Wang G, Sun Z. Abnormally Strong Electron–Phonon Scattering Induced Unprecedented Reduction in Lattice Thermal Conductivity of Two-Dimensional Nb2C. J Am Chem Soc 2019; 141:8503-8508. [DOI: 10.1021/jacs.9b01742] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongda Huang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
| | - Jian Zhou
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
| | - Guanjie Wang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
| | - Zhimei Sun
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
- Center for Integrated Computational Materials Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, China
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8
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Novko D, Tremblay JC, Alducin M, Juaristi JI. Ultrafast Transient Dynamics of Adsorbates on Surfaces Deciphered: The Case of CO on Cu(100). PHYSICAL REVIEW LETTERS 2019; 122:016806. [PMID: 31012646 DOI: 10.1103/physrevlett.122.016806] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Indexed: 06/09/2023]
Abstract
Time-resolved vibrational spectroscopy constitutes an invaluable experimental tool for monitoring hot-carrier-induced surface reactions. However, the absence of a full understanding of the precise microscopic mechanisms causing the transient spectral changes has limited its applicability. Here we introduce a robust first-principles theoretical framework that successfully explains both the nonthermal frequency and linewidth changes of the CO internal stretch mode on Cu(100) induced by femtosecond laser pulses. Two distinct processes engender the changes: electron-hole pair excitations underlie the nonthermal frequency shifts, while electron-mediated vibrational mode coupling gives rise to linewidth changes. Furthermore, the origin and precise sequence of coupling events are finally identified.
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Affiliation(s)
- D Novko
- Center of Excellence for Advanced Materials and Sensing Devices, Institute of Physics, Bijenička 46, 10000 Zagreb, Croatia
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - J C Tremblay
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany
| | - M Alducin
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
- Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
| | - J I Juaristi
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
- Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
- Departamento de Física de Materiales, Facultad de Químicas UPV/EHU, Apartado 1072, 20080 Donostia-San Sebastián, Spain
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9
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Uchiyama H, Oshima Y, Patterson R, Iwamoto S, Shiomi J, Shimamura K. Phonon Lifetime Observation in Epitaxial ScN Film with Inelastic X-Ray Scattering Spectroscopy. PHYSICAL REVIEW LETTERS 2018; 120:235901. [PMID: 29932681 DOI: 10.1103/physrevlett.120.235901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/21/2018] [Indexed: 06/08/2023]
Abstract
Phonon-phonon scattering dominates the thermal properties in nonmetallic materials, and it directly influences device performance in applications. The understanding of the scattering has been progressing using computational approaches, and the direct and systematic observation of phonon modes that include momentum dependences is desirable. We report experimental data on the phonon dispersion curves and lifetimes in an epitaxially grown ScN film using inelastic x-ray scattering measurements. The momentum dependence of the optical phonon lifetimes is estimated from the spectral width, and the highest-energy phonon mode around the zone center is found to possess a short lifetime of 0.21 ps. A comparison with first-principles calculations shows that our observed phonon lifetimes are quantitatively explained by three-body phonon-phonon interactions.
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Affiliation(s)
- H Uchiyama
- Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Koto, Sayo, Hyogo 679-5198, Japan
| | - Y Oshima
- Optical Single Crystals Group, Environment and Energy Materials Research Division, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - R Patterson
- School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney 2052, Australia
| | - S Iwamoto
- Department of Mechanical Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - J Shiomi
- Department of Mechanical Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
| | - K Shimamura
- Optical Single Crystals Group, Environment and Energy Materials Research Division, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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Wang BT, Liu PF, Bo T, Yin W, Eriksson O, Zhao J, Wang F. Superconductivity in two-dimensional phosphorus carbide (β0-PC). Phys Chem Chem Phys 2018; 20:12362-12367. [DOI: 10.1039/c8cp00697k] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The out-of-plane Pz vibrational modes in two-dimensional phosphorus carbide lead to intrinsic superconductivity with a Kohn anomaly.
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Affiliation(s)
- Bao-Tian Wang
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Institute of Neutron Science (DINS)
| | - Peng-Fei Liu
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Institute of Neutron Science (DINS)
| | - Tao Bo
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Institute of Neutron Science (DINS)
| | - Wen Yin
- Institute of High Energy Physics
- Chinese Academy of Sciences (CAS)
- Beijing 100049
- China
- Dongguan Institute of Neutron Science (DINS)
| | - Olle Eriksson
- Department of Physics and Astronomy
- Division of Materials Theory
- Uppsala University
- SE-75120 Uppsala
- Sweden
| | - Jijun Zhao
- Key Laboratory of Materials Modication by Laser
- Ion and Electron Beams (Dalian University of Technology)
- Ministry of Education
- Dalian 116024
- China
| | - Fangwei Wang
- Dongguan Institute of Neutron Science (DINS)
- Dongguan 523808
- China
- Beijing National Laboratory for Condensed Matter Physics
- Institute of Physics
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