@article{11b2de10c9f74f9ab9ea483c569d14cc,
title = "Electron-phonon coupling in the charge density wave state of CsV3Sb5",
abstract = "Metallic materials with kagome lattice structure are interesting because their electronic structures can host flat bands, Dirac cones, and van Hove singularities, resulting in strong electron correlations, nontrivial band topology, charge density wave (CDW), and unconventional superconductivity. Recently, kagome lattice compounds AV3Sb5 (A=K, Rb, Cs) are found to have intertwined CDW order and superconductivity. The origin of the CDW has been suggested to arise from Fermi-surface instabilities of van Hove singularity (saddle point) near the M points with weak electron-phonon coupling. Here we use neutron scattering experiments to demonstrate that the CDW order in CsV3Sb5 is associated with static lattice distortion and a sudden hardening of the B3u longitudinal optical phonon mode at the Brillouin zone boundary, thus establishing that the wave vector dependent electron-phonon coupling must also play an important role in the CDW order of AV3Sb5.",
author = "Yaofeng Xie and Yongkai Li and Philippe Bourges and Alexandre Ivanov and Zijin Ye and Yin, {Jia Xin} and Hasan, {M. Zahid} and Aiyun Luo and Yugui Yao and Zhiwei Wang and Gang Xu and Pengcheng Dai",
note = "Funding Information: P.D. is grateful to Binghai Yan, B. R. Ortiz, and Stephen Wilson for helpful discussions. The neutron scattering and basic materials characterization work at Rice is supported by the U.S. DOE, BES under Grant No. DE-SC0012311 and by the Robert A. Welch Foundation under Grant No. C-1839, respectively (P.D.). The work at Beijing Institute of Technology was supported by the National Key R&D Program of China (Grant No. 2020YFA0308800), the Natural Science Foundation of China (Grants No. 92065109 and No. 11734003), the Beijing Natural Science Foundation (Grants No. Z190006 and No. Z210006), and the Beijing Institute of Technology (BIT) Research Fund Program for Young Scholars (Grant No. 3180012222011). Z.W. thanks the Analysis & Testing Center at BIT for assistance in facility support. Work at Huazhong University of Science and Technology was supported by the National Key Research and Development Program of China (2018YFA0307000), and the National Natural Science Foundation of China (11874022). Materials characterization and the study of topological quantum properties were supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center and Princeton University (M.Z.H.). Publisher Copyright: {\textcopyright} 2022 American Physical Society.",
year = "2022",
month = apr,
day = "1",
doi = "10.1103/PhysRevB.105.L140501",
language = "English (US)",
volume = "105",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "14",
}