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Observation of anomalous amplitude modes in the kagome metal CsV3Sb5

Author

Listed:
  • 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
    Nanjing University)

  • Yaomin Dai

    (Nanjing University
    Nanjing University)

  • Hai-Hu Wen

    (Nanjing University
    Nanjing University)

  • Binghai Yan

    (Weizmann Institute of Science)

  • Xiaoxiang Xi

    (Nanjing University
    Nanjing University)

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.

Suggested Citation

  • 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 & Xiaoxiang Xi, 2022. "Observation of anomalous amplitude modes in the kagome metal CsV3Sb5," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31162-1
    DOI: 10.1038/s41467-022-31162-1
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    2. Ge He & Leander Peis & Emma Frances Cuddy & Zhen Zhao & Dong Li & Yuhang Zhang & Romona Stumberger & Brian Moritz & Haitao Yang & Hongjun Gao & Thomas Peter Devereaux & Rudi Hackl, 2024. "Anharmonic strong-coupling effects at the origin of the charge density wave in CsV3Sb5," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    3. Asish K. Kundu & Xiong Huang & Eric Seewald & Ethan Ritz & Santanu Pakhira & Shuai Zhang & Dihao Sun & Simon Turkel & Sara Shabani & Turgut Yilmaz & Elio Vescovo & Cory R. Dean & David C. Johnston & T, 2024. "Low-energy electronic structure in the unconventional charge-ordered state of ScV6Sn6," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    4. Changwon Park & Young-Woo Son, 2023. "Condensation of preformed charge density waves in kagome metals," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    5. SeongJin Kwon & Hyunjin Jung & SangJin Lee & Gil Young Cho & KiJeong Kong & ChoongJae Won & Sang-Wook Cheong & Han Woong Yeom, 2024. "Dual Higgs modes entangled into a soliton lattice in CuTe," Nature Communications, Nature, vol. 15(1), pages 1-6, December.
    6. Boqin Song & Tianping Ying & Xianxin Wu & Wei Xia & Qiangwei Yin & Qinghua Zhang & Yanpeng Song & Xiaofan Yang & Jiangang Guo & Lin Gu & Xiaolong Chen & Jiangping Hu & Andreas P. Schnyder & Hechang Le, 2023. "Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    7. Bin Hu & Hui Chen & Yuhan Ye & Zihao Huang & Xianghe Han & Zhen Zhao & Hongqin Xiao & Xiao Lin & Haitao Yang & Ziqiang Wang & Hong-Jun Gao, 2024. "Evidence of a distinct collective mode in Kagome superconductors," Nature Communications, Nature, vol. 15(1), pages 1-11, December.

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