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A metallic mosaic phase and the origin of Mott-insulating state in 1T-TaS2

Author

Listed:
  • Liguo Ma

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • Cun Ye

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • Yijun Yu

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • Xiu Fang Lu

    (Collaborative Innovation Center of Advanced Microstructures
    University of Science and Technology of China
    Key Laboratory of Strongly Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China)

  • Xiaohai Niu

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • Sejoong Kim

    (Korea Institute for Advanced Study)

  • Donglai Feng

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

  • David Tománek

    (Michigan State University)

  • Young-Woo Son

    (Korea Institute for Advanced Study)

  • Xian Hui Chen

    (Collaborative Innovation Center of Advanced Microstructures
    University of Science and Technology of China
    Key Laboratory of Strongly Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China)

  • Yuanbo Zhang

    (Fudan University
    Collaborative Innovation Center of Advanced Microstructures)

Abstract

Electron–electron and electron–phonon interactions are two major driving forces that stabilize various charge-ordered phases of matter. In layered compound 1T-TaS2, the intricate interplay between the two generates a Mott-insulating ground state with a peculiar charge-density-wave (CDW) order. The delicate balance also makes it possible to use external perturbations to create and manipulate novel phases in this material. Here, we study a mosaic CDW phase induced by voltage pulses, and find that the new phase exhibits electronic structures entirely different from that of the original Mott ground state. The mosaic phase consists of nanometre-sized domains characterized by well-defined phase shifts of the CDW order parameter in the topmost layer, and by altered stacking relative to the layers underneath. We discover that the nature of the new phase is dictated by the stacking order, and our results shed fresh light on the origin of the Mott phase in 1T-TaS2.

Suggested Citation

  • Liguo Ma & Cun Ye & Yijun Yu & Xiu Fang Lu & Xiaohai Niu & Sejoong Kim & Donglai Feng & David Tománek & Young-Woo Son & Xian Hui Chen & Yuanbo Zhang, 2016. "A metallic mosaic phase and the origin of Mott-insulating state in 1T-TaS2," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10956
    DOI: 10.1038/ncomms10956
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    Cited by:

    1. Yihao Wang & Zhihao Li & Xuan Luo & Jingjing Gao & Yuyan Han & Jialiang Jiang & Jin Tang & Huanxin Ju & Tongrui Li & Run Lv & Shengtao Cui & Yingguo Yang & Yuping Sun & Junfa Zhu & Xingyu Gao & Wenjia, 2024. "Dualistic insulator states in 1T-TaS2 crystals," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Anze Mraz & Michele Diego & Andrej Kranjec & Jaka Vodeb & Peter Karpov & Yaroslav Gerasimenko & Jan Ravnik & Yevhenii Vaskivskyi & Rok Venturini & Viktor Kabanov & Benjamin Lipovšek & Marko Topič & Ig, 2023. "Manipulation of fractionalized charge in the metastable topologically entangled state of a doped Wigner crystal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. E. S. Bozin & M. Abeykoon & S. Conradson & G. Baldinozzi & P. Sutar & D. Mihailovic, 2023. "Crystallization of polarons through charge and spin ordering transitions in 1T-TaS2," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Sung-Hoon Lee & Doohee Cho, 2023. "Charge density wave surface reconstruction in a van der Waals layered material," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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