Observation of anomalous amplitude modes in the kagome metal CsV3Sb5

Gan Liu, Xinran Ma, Kuanyu He, Qing Li, Hengxin Tan, Yizhou Liu, Jie Xu, Wenna Tang, Kenji Watanabe, Takashi Taniguchi, Libo Gao, Yaomin Dai, Hai-Hu Wen, Binghai Yan () and Xiaoxiang Xi ()
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Gan Liu: Nanjing University
Xinran Ma: Nanjing University
Kuanyu He: Nanjing University
Qing Li: Nanjing University
Hengxin Tan: Weizmann Institute of Science
Yizhou Liu: Weizmann Institute of Science
Jie Xu: Nanjing University
Wenna Tang: Nanjing University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Libo Gao: Nanjing University
Yaomin Dai: Nanjing University
Hai-Hu Wen: Nanjing University
Binghai Yan: Weizmann Institute of Science
Xiaoxiang Xi: Nanjing University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract The kagome lattice provides a fertile platform to explore novel symmetry-breaking states. Charge-density wave (CDW) instabilities have been recently discovered in a new kagome metal family, commonly considered to arise from Fermi-surface instabilities. Here we report the observation of Raman-active CDW amplitude modes in CsV3Sb5, which are collective excitations typically thought to emerge out of frozen soft phonons, although phonon softening is elusive experimentally. The amplitude modes strongly hybridize with other superlattice modes, imparting them with clear temperature-dependent frequency shift and broadening, rarely seen in other known CDW materials. Both the mode mixing and the large amplitude mode frequencies suggest that the CDW exhibits the character of strong electron-phonon coupling, a regime in which phonon softening can cease to exist. Our work highlights the importance of the lattice degree of freedom in the CDW formation and points to the complex nature of the mechanism.

Date: 2022
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DOI: 10.1038/s41467-022-31162-1

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