Anharmonic strong-coupling effects at the origin of the charge density wave in CsV3Sb5

Ge He (), Leander Peis, Emma Frances Cuddy, Zhen Zhao, Dong Li, Yuhang Zhang, Romona Stumberger, Brian Moritz, Haitao Yang (), Hongjun Gao, Thomas Peter Devereaux () and Rudi Hackl ()
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Ge He: Bayerische Akademie der Wissenschaften
Leander Peis: Bayerische Akademie der Wissenschaften
Emma Frances Cuddy: Stanford University
Zhen Zhao: Chinese Academy of Sciences
Dong Li: Chinese Academy of Sciences
Yuhang Zhang: Chinese Academy of Sciences
Romona Stumberger: Bayerische Akademie der Wissenschaften
Brian Moritz: SLAC National Accelerator Laboratory and Stanford University
Haitao Yang: Chinese Academy of Sciences
Hongjun Gao: Chinese Academy of Sciences
Thomas Peter Devereaux: Stanford University
Rudi Hackl: Bayerische Akademie der Wissenschaften

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: 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 $$2{\Delta }_{\max }/{k}_{{{{{{{{\rm{B}}}}}}}}}{T}_{{{{{{{{\rm{CDW}}}}}}}}}\, \approx \, 20$$ 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.

Date: 2024
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DOI: 10.1038/s41467-024-45865-0

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