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Band insulator to Mott insulator transition in 1T-TaS2

Author

Listed:
  • Y. D. Wang

    (Peking University)

  • W. L. Yao

    (Peking University)

  • Z. M. Xin

    (Peking University)

  • T. T. Han

    (Peking University)

  • Z. G. Wang

    (Peking University)

  • L. Chen

    (Peking University)

  • C. Cai

    (Peking University)

  • Yuan Li

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

  • Y. Zhang

    (Peking University
    Collaborative Innovation Center of Quantum Matter)

Abstract

1T-TaS2 undergoes successive phase transitions upon cooling and eventually enters an insulating state of mysterious origin. Some consider this state to be a band insulator with interlayer stacking order, yet others attribute it to Mott physics that support a quantum spin liquid state. Here, we determine the electronic and structural properties of 1T-TaS2 using angle-resolved photoemission spectroscopy and X-Ray diffraction. At low temperatures, the 2π/2c-periodic band dispersion, along with half-integer-indexed diffraction peaks along the c axis, unambiguously indicates that the ground state of 1T-TaS2 is a band insulator with interlayer dimerization. Upon heating, however, the system undergoes a transition into a Mott insulating state, which only exists in a narrow temperature window. Our results refute the idea of searching for quantum magnetism in 1T-TaS2 only at low temperatures, and highlight the competition between on-site Coulomb repulsion and interlayer hopping as a crucial aspect for understanding the material’s electronic properties.

Suggested Citation

  • Y. D. Wang & W. L. Yao & Z. M. Xin & T. T. Han & Z. G. Wang & L. Chen & C. Cai & Yuan Li & Y. Zhang, 2020. "Band insulator to Mott insulator transition in 1T-TaS2," Nature Communications, Nature, vol. 11(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18040-4
    DOI: 10.1038/s41467-020-18040-4
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    Cited by:

    1. Le Lei & Jiaqi Dai & Haoyu Dong & Yanyan Geng & Feiyue Cao & Cong Wang & Rui Xu & Fei Pang & Zheng-Xin Liu & Fangsen Li & Zhihai Cheng & Guang Wang & Wei Ji, 2023. "Electronic Janus lattice and kagome-like bands in coloring-triangular MoTe2 monolayers," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    2. Shiwei Shen & Chenhaoping Wen & Pengfei Kong & Jingjing Gao & Jianguo Si & Xuan Luo & Wenjian Lu & Yuping Sun & Gang Chen & Shichao Yan, 2022. "Inducing and tuning Kondo screening in a narrow-electronic-band system," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. 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.
    4. 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.
    5. Seyeong Cha & Giyeok Lee & Sol Lee & Sae Hee Ryu & Yeongsup Sohn & Gijeong An & Changmo Kang & Minsu Kim & Kwanpyo Kim & Aloysius Soon & Keun Su Kim, 2023. "Order-disorder phase transition driven by interlayer sliding in lead iodides," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    6. 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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