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Observation of topological superconductivity in a stoichiometric transition metal dichalcogenide 2M-WS2

Author

Listed:
  • Y. W. Li

    (School of Physical Science and Technology, ShanghaiTech University
    University of Oxford
    ShanghaiTech Laboratory for Topological Physics)

  • H. J. Zheng

    (School of Physical Science and Technology, ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics
    University of Chinese Academy of Sciences)

  • Y. Q. Fang

    (State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science
    Peking University)

  • D. Q. Zhang

    (China Jiliang University
    National Laboratory of Solid State Microstructures and School of Physics Nanjing University
    Collaborative Innovation Center of Advanced Microstructures)

  • Y. J. Chen

    (Tsinghua University)

  • C. Chen

    (School of Physical Science and Technology, ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics
    Advanced Light Source, Lawrence Berkeley National Laboratory)

  • A. J. Liang

    (School of Physical Science and Technology, ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics)

  • W. J. Shi

    (ShanghaiTech University
    Shanghai high repetition rate XFEL and extreme light facility (SHINE), ShanghaiTech University)

  • D. Pei

    (University of Oxford)

  • L. X. Xu

    (School of Physical Science and Technology, ShanghaiTech University
    University of Chinese Academy of Sciences)

  • S. Liu

    (School of Physical Science and Technology, ShanghaiTech University
    University of Chinese Academy of Sciences)

  • J. Pan

    (State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science)

  • D. H. Lu

    (SLAC National Accelerator Laboratory)

  • M. Hashimoto

    (SLAC National Accelerator Laboratory)

  • A. Barinov

    (Elettra-Sincrotrone Trieste, Trieste)

  • S. W. Jung

    (Diamond Light Source, Harwell Campus
    Gyeongsang National University)

  • C. Cacho

    (Diamond Light Source, Harwell Campus)

  • M. X. Wang

    (School of Physical Science and Technology, ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics)

  • Y. He

    (University of California at Berkeley)

  • L. Fu

    (Massachusetts Institute of Technology)

  • H. J. Zhang

    (National Laboratory of Solid State Microstructures and School of Physics Nanjing University
    Collaborative Innovation Center of Advanced Microstructures)

  • F. Q. Huang

    (State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Science
    Peking University)

  • L. X. Yang

    (Tsinghua University
    Frontier Science Center for Quantum Information)

  • Z. K. Liu

    (School of Physical Science and Technology, ShanghaiTech University
    ShanghaiTech Laboratory for Topological Physics)

  • Y. L. Chen

    (School of Physical Science and Technology, ShanghaiTech University
    University of Oxford
    ShanghaiTech Laboratory for Topological Physics
    Tsinghua University)

Abstract

Topological superconductors (TSCs) are unconventional superconductors with bulk superconducting gap and in-gap Majorana states on the boundary that may be used as topological qubits for quantum computation. Despite their importance in both fundamental research and applications, natural TSCs are very rare. Here, combining state of the art synchrotron and laser-based angle-resolved photoemission spectroscopy, we investigated a stoichiometric transition metal dichalcogenide (TMD), 2M-WS2 with a superconducting transition temperature of 8.8 K (the highest among all TMDs in the natural form up to date) and observed distinctive topological surface states (TSSs). Furthermore, in the superconducting state, we found that the TSSs acquired a nodeless superconducting gap with similar magnitude as that of the bulk states. These discoveries not only evidence 2M-WS2 as an intrinsic TSC without the need of sensitive composition tuning or sophisticated heterostructures fabrication, but also provide an ideal platform for device applications thanks to its van der Waals layered structure.

Suggested Citation

  • Y. W. Li & H. J. Zheng & Y. Q. Fang & D. Q. Zhang & Y. J. Chen & C. Chen & A. J. Liang & W. J. Shi & D. Pei & L. X. Xu & S. Liu & J. Pan & D. H. Lu & M. Hashimoto & A. Barinov & S. W. Jung & C. Cacho , 2021. "Observation of topological superconductivity in a stoichiometric transition metal dichalcogenide 2M-WS2," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-23076-1
    DOI: 10.1038/s41467-021-23076-1
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    Cited by:

    1. Xiangye Liu & Pingting Zhang & Shiyao Wang & Yuqiang Fang & Penghui Wu & Yue Xiang & Jipeng Chen & Chendong Zhao & Xian Zhang & Wei Zhao & Junjie Wang & Fuqiang Huang & Cao Guan, 2024. "High intrinsic phase stability of ultrathin 2M WS2," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Yiwei Li & Lixuan Xu & Gan Liu & Yuqiang Fang & Huijun Zheng & Shenghao Dai & Enting Li & Guang Zhu & Shihao Zhang & Shiheng Liang & Lexian Yang & Fuqiang Huang & Xiaoxiang Xi & Zhongkai Liu & Nan Xu , 2024. "Evidence of strong and mode-selective electron–phonon coupling in the topological superconductor candidate 2M-WS2," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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