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He G, Peis L, Cuddy EF, Zhao Z, Li D, Zhang Y, Stumberger R, Moritz B, Yang H, Gao H, Devereaux TP, Hackl R. Anharmonic strong-coupling effects at the origin of the charge density wave in CsV 3Sb 5. Nat Commun 2024; 15:1895. [PMID: 38429269 PMCID: PMC10907679 DOI: 10.1038/s41467-024-45865-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 02/06/2024] [Indexed: 03/03/2024] Open
Abstract
The formation of charge density waves is a long-standing open problem, particularly in dimensions higher than one. Various observations in the vanadium antimonides discovered recently further underpin this notion. Here, we study the Kagome metal CsV3Sb5 using polarized inelastic light scattering and density functional theory calculations. We observe a significant gap anisotropy with 2 Δ max / k B T CDW ≈ 20 , far beyond the prediction of mean-field theory. The analysis of the A1g and E2g phonons, including those emerging below TCDW, indicates strong phonon-phonon coupling, presumably mediated by a strong electron-phonon interaction. Similarly, the asymmetric Fano-type lineshape of the A1g amplitude mode suggests strong electron-phonon coupling below TCDW. The large electronic gap, the enhanced anharmonic phonon-phonon coupling, and the Fano shape of the amplitude mode combined are more supportive of a strong-coupling phonon-driven charge density wave transition than of a Fermi surface instability or an exotic mechanism in CsV3Sb5.
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Affiliation(s)
- Ge He
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, 85748, Germany.
- Department of Physics, University College Cork, College Road, Cork, T12 K8AF, Ireland.
| | - Leander Peis
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, 85748, Germany
- School of Natural Sciences, Technische Universität München, Garching, 85748, Germany
- IFW Dresden, Helmholtzstrasse 20, Dresden, 01069, Germany
- Capgemini, Frankfurter Ring 81, 80807, München, Germany
| | - Emma Frances Cuddy
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Zhen Zhao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Dong Li
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Yuhang Zhang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
| | - Romona Stumberger
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, 85748, Germany
- School of Natural Sciences, Technische Universität München, Garching, 85748, Germany
- Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272, Renningen, Germany
| | - Brian Moritz
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Haitao Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.
| | - Hongjun Gao
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China
- School of Physical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Thomas Peter Devereaux
- Department of Materials Science and Engineering, Stanford University, Stanford, CA, 94305, USA.
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
- Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, 94305, USA.
| | - Rudi Hackl
- Walther Meissner Institut, Bayerische Akademie der Wissenschaften, Garching, 85748, Germany.
- School of Natural Sciences, Technische Universität München, Garching, 85748, Germany.
- IFW Dresden, Helmholtzstrasse 20, Dresden, 01069, Germany.
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2
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Rosmus M, Olszowska N, Bukowski Z, Starowicz P, Piekarz P, Ptok A. Electronic Band Structure and Surface States in Dirac Semimetal LaAgSb 2. MATERIALS (BASEL, SWITZERLAND) 2022; 15:7168. [PMID: 36295236 PMCID: PMC9609572 DOI: 10.3390/ma15207168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/06/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
LaAgSb2 is a Dirac semimetal showing charge density wave (CDW) order. Previous angle-resolved photoemission spectroscopy (ARPES) results suggest the existence of the Dirac-cone-like structure in the vicinity of the Fermi level along the Γ-M direction. This paper is devoted to a complex analysis of the electronic band structure of LaAgSb2 by means of ARPES and theoretical studies within the ab initio method as well as tight binding model formulation. To investigate the possible surface states, we performed the direct DFT slab calculation and the surface Green function calculation for the (001) surface. The appearance of the surface states, which depends strongly on the surface, points to the conclusion that LaSb termination is realized in the cleaved crystals. Moreover, the surface states predicted by our calculations at the Γ and X points are found by ARPES. Nodal lines, which exist along the X-R and M-A paths due to crystal symmetry, are also observed experimentally. The calculations reveal other nodal lines, which originate from the vanishing of spin-orbit splitting and are located at the X-M-A-R plane at the Brillouin zone boundary. In addition, we analyze the band structure along the Γ-M path to verify whether Dirac surface states can be expected. Their appearance in this region is not confirmed.
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Affiliation(s)
- Marcin Rosmus
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. S. Łojasiewicza 11, 30-348 Kraków, Poland
- Solaris National Synchrotron Radiation Centre, Jagiellonian University, Czerwone Maki 98, 30-392 Kraków, Poland
| | - Natalia Olszowska
- Solaris National Synchrotron Radiation Centre, Jagiellonian University, Czerwone Maki 98, 30-392 Kraków, Poland
| | - Zbigniew Bukowski
- Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland
| | - Paweł Starowicz
- Marian Smoluchowski Institute of Physics, Jagiellonian University, Prof. S. Łojasiewicza 11, 30-348 Kraków, Poland
| | - Przemysław Piekarz
- Institute of Nuclear Physics, Polish Academy of Sciences, W. E. Radzikowskiego 152, 31-342 Kraków, Poland
| | - Andrzej Ptok
- Institute of Nuclear Physics, Polish Academy of Sciences, W. E. Radzikowskiego 152, 31-342 Kraków, Poland
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Dong T, Zhang SJ, Wang NL. Recent Development of Ultrafast Optical Characterizations for Quantum Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022:e2110068. [PMID: 35853841 DOI: 10.1002/adma.202110068] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 06/09/2022] [Indexed: 06/15/2023]
Abstract
The advent of intense ultrashort optical pulses spanning a frequency range from terahertz to the visible has opened a new era in the experimental investigation and manipulation of quantum materials. The generation of strong optical field in an ultrashort time scale enables the steering of quantum materials nonadiabatically, inducing novel phenomenon or creating new phases which may not have an equilibrium counterpart. Ultrafast time-resolved optical techniques have provided rich information and played an important role in characterization of the nonequilibrium and nonlinear properties of solid systems. Here, some of the recent progress of ultrafast optical techniques and their applications to the detection and manipulation of physical properties in selected quantum materials are reviewed. Specifically, the new development in the detection of the Higgs mode and photoinduced nonequilibrium response in the study of superconductors by time-resolved terahertz spectroscopy are discussed.
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Affiliation(s)
- Tao Dong
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
| | - Si-Jie Zhang
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
| | - Nan-Lin Wang
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China
- Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
- Beijing Academy of Quantum Information Sciences, Beijing, 100913, China
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4
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Skaggs CM, Kang CJ, Perez CJ, Hadermann J, Emge TJ, Frank CE, Pak C, Lapidus SH, Walker D, Kotliar G, Kauzlarich SM, Tan X, Greenblatt M. Ambient and High Pressure CuNiSb 2: Metal-Ordered and Metal-Disordered NiAs-Type Derivative Pnictides. Inorg Chem 2020; 59:14058-14069. [DOI: 10.1021/acs.inorgchem.0c01848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Callista M. Skaggs
- Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States
| | - Chang-Jong Kang
- Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Christopher J. Perez
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Joke Hadermann
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
| | - Thomas J. Emge
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Corey E. Frank
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Chongin Pak
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Saul H. Lapidus
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - David Walker
- Lamont Doherty Earth Observatory, Columbia University, Palisades, New York 10964, United States
| | - Gabriel Kotliar
- Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Susan M. Kauzlarich
- Department of Chemistry, University of California, Davis, California 95616, United States
| | - Xiaoyan Tan
- Department of Chemistry and Biochemistry, George Mason University, Fairfax, Virginia 22030, United States
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
| | - Martha Greenblatt
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, United States
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Liu YP, Zhang YJ, Dong JJ, Lee H, Wei ZX, Zhang WL, Chen CY, Yuan HQ, Yang YF, Qi J. Hybridization Dynamics in CeCoIn_{5} Revealed by Ultrafast Optical Spectroscopy. PHYSICAL REVIEW LETTERS 2020; 124:057404. [PMID: 32083911 DOI: 10.1103/physrevlett.124.057404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 01/14/2020] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
We investigate the quasiparticle dynamics in the prototypical heavy fermion CeCoIn_{5} using ultrafast optical pump-probe spectroscopy. Our results indicate that this material system undergoes hybridization fluctuations before the establishment of heavy electron coherence, as the temperature decreases from ∼120 K (T^{†}) to ∼55 K (T^{*}). We reveal that the anomalous coherent phonon softening and damping reduction below T^{*} are directly associated with the emergence of collective hybridization. We also discover a distinct collective mode with an energy of ∼8 meV, which may be experimental evidence of the predicted unconventional density wave. Our findings provide important information for understanding the hybridization dynamics in heavy fermion systems.
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Affiliation(s)
- Y P Liu
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
- Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - Y J Zhang
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - J J Dong
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - H Lee
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - Z X Wei
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
- Institute of Electronic and Information Engineering, University of Electronic Science and Technology of China, Dongguan 523808, China
| | - W L Zhang
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
| | - C Y Chen
- Institute of Modern Physics, Fudan University, Shanghai 200433, China
| | - H Q Yuan
- Center for Correlated Matter and Department of Physics, Zhejiang University, Hangzhou 310058, China
| | - Yi-Feng Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Songshan Lake Materials Laboratory, Dongguan 523808, China
| | - J Qi
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China
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