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Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides

Author

Listed:
  • Dongjing Lin

    (Nanjing University)

  • Shichao Li

    (Nanjing University)

  • Jinsheng Wen

    (Nanjing University
    Nanjing University)

  • Helmuth Berger

    (École Polytechnique Fédérale de Lausanne)

  • László Forró

    (École Polytechnique Fédérale de Lausanne)

  • Huibin Zhou

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Shuang Jia

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Xiaoxiang Xi

    (Nanjing University
    Nanjing University)

  • Mohammad Saeed Bahramy

    (The University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

Abstract

Charge density wave (CDW) is a startling quantum phenomenon, distorting a metallic lattice into an insulating state with a periodically modulated charge distribution. Astonishingly, such modulations appear in various patterns even within the same family of materials. Moreover, this phenomenon features a puzzling diversity in its dimensional evolution. Here, we propose a general framework, unifying distinct trends of CDW ordering in an isoelectronic group of materials, 2H-MX2 (M = Nb, Ta and X = S, Se). We show that while NbSe2 exhibits a strongly enhanced CDW order in two dimensions, TaSe2 and TaS2 behave oppositely, with CDW being absent in NbS2 entirely. Such a disparity is demonstrated to arise from a competition of ionic charge transfer, electron-phonon coupling, and electron correlation. Despite its simplicity, our approach can, in principle, explain dimensional dependence of CDW in any material, thereby shedding new light on this intriguing quantum phenomenon and its underlying mechanisms.

Suggested Citation

  • Dongjing Lin & Shichao Li & Jinsheng Wen & Helmuth Berger & László Forró & Huibin Zhou & Shuang Jia & Takashi Taniguchi & Kenji Watanabe & Xiaoxiang Xi & Mohammad Saeed Bahramy, 2020. "Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides," Nature Communications, Nature, vol. 11(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-15715-w
    DOI: 10.1038/s41467-020-15715-w
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    Cited by:

    1. 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.

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