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Observation and control of the weak topological insulator state in ZrTe5

Author

Listed:
  • Peng Zhang

    (University of Tokyo)

  • Ryo Noguchi

    (University of Tokyo)

  • Kenta Kuroda

    (University of Tokyo)

  • Chun Lin

    (University of Tokyo)

  • Kaishu Kawaguchi

    (University of Tokyo)

  • Koichiro Yaji

    (National Institute for Materials Science)

  • Ayumi Harasawa

    (University of Tokyo)

  • Mikk Lippmaa

    (University of Tokyo)

  • Simin Nie

    (Stanford University)

  • Hongming Weng

    (Chinese Academy of Sciences)

  • V. Kandyba

    (Elettra - Sincrotrone Trieste)

  • A. Giampietri

    (Elettra - Sincrotrone Trieste)

  • A. Barinov

    (Elettra - Sincrotrone Trieste)

  • Qiang Li

    (Stony Brook University
    Brookhaven National Laboratory)

  • G. D. Gu

    (Brookhaven National Laboratory)

  • Shik Shin

    (University of Tokyo
    University of Tokyo)

  • Takeshi Kondo

    (University of Tokyo
    University of Tokyo)

Abstract

A quantum spin Hall (QSH) insulator hosts topological states at the one-dimensional (1D) edge, along which backscattering by nonmagnetic impurities is strictly prohibited. Its 3D analogue, a weak topological insulator (WTI), possesses similar quasi-1D topological states confined at side surfaces. The enhanced confinement could provide a route for dissipationless current and better advantages for applications relative to strong topological insulators (STIs). However, the topological side surface is usually not cleavable and is thus hard to observe. Here, we visualize the topological states of the WTI candidate ZrTe5 by spin and angle-resolved photoemission spectroscopy (ARPES): a quasi-1D band with spin-momentum locking was revealed on the side surface. We further demonstrate that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state. The highly directional spin-current and the tunable band gap in ZrTe5 will provide an excellent platform for applications.

Suggested Citation

  • Peng Zhang & Ryo Noguchi & Kenta Kuroda & Chun Lin & Kaishu Kawaguchi & Koichiro Yaji & Ayumi Harasawa & Mikk Lippmaa & Simin Nie & Hongming Weng & V. Kandyba & A. Giampietri & A. Barinov & Qiang Li &, 2021. "Observation and control of the weak topological insulator state in ZrTe5," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-020-20564-8
    DOI: 10.1038/s41467-020-20564-8
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    Cited by:

    1. Jinyu Liu & Yinong Zhou & Sebastian Yepez Rodriguez & Matthew A. Delmont & Robert A. Welser & Triet Ho & Nicholas Sirica & Kaleb McClure & Paolo Vilmercati & Joseph W. Ziller & Norman Mannella & Javie, 2024. "Controllable strain-driven topological phase transition and dominant surface-state transport in HfTe5," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. Lun-Hui Hu & Rui-Xing Zhang, 2024. "Dislocation Majorana bound states in iron-based superconductors," Nature Communications, Nature, vol. 15(1), pages 1-12, December.
    3. Yong-Jie Xu & Guohua Cao & Qi-Yuan Li & Cheng-Long Xue & Wei-Min Zhao & Qi-Wei Wang & Li-Guo Dou & Xuan Du & Yu-Xin Meng & Yuan-Kun Wang & Yu-Hang Gao & Zhen-Yu Jia & Wei Li & Lianlian Ji & Fang-Sen L, 2024. "Realization of monolayer ZrTe5 topological insulators with wide band gaps," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    4. Jingyuan Zhong & Ming Yang & Zhijian Shi & Yaqi Li & Dan Mu & Yundan Liu & Ningyan Cheng & Wenxuan Zhao & Weichang Hao & Jianfeng Wang & Lexian Yang & Jincheng Zhuang & Yi Du, 2023. "Towards layer-selective quantum spin hall channels in weak topological insulator Bi4Br2I2," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    5. Dong Xing & Bingbing Tong & Senyang Pan & Zezhi Wang & Jianlin Luo & Jinglei Zhang & Cheng-Long Zhang, 2024. "Rashba-splitting-induced topological flat band detected by anomalous resistance oscillations beyond the quantum limit in ZrTe5," Nature Communications, Nature, vol. 15(1), pages 1-7, December.

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