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Large quantum-spin-Hall gap in single-layer 1T′ WSe2

Author

Listed:
  • P. Chen

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    Lawrence Berkeley National Laboratory)

  • Woei Wu Pai

    (National Taiwan University
    National Taiwan University
    National Taiwan University)

  • Y.-H. Chan

    (Academia Sinica)

  • W.-L. Sun

    (National Tsing Hua University)

  • C.-Z. Xu

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • D.-S. Lin

    (National Tsing Hua University)

  • M. Y. Chou

    (National Taiwan University
    National Taiwan University
    Georgia Institute of Technology)

  • A.-V. Fedorov

    (Lawrence Berkeley National Laboratory)

  • T.-C. Chiang

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign
    National Taiwan University)

Abstract

Two-dimensional (2D) topological insulators (TIs) are promising platforms for low-dissipation spintronic devices based on the quantum-spin-Hall (QSH) effect, but experimental realization of such systems with a large band gap suitable for room-temperature applications has proven difficult. Here, we report the successful growth on bilayer graphene of a quasi-freestanding WSe2 single layer with the 1T′ structure that does not exist in the bulk form of WSe2. Using angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy/spectroscopy (STM/STS), we observe a gap of 129 meV in the 1T′ layer and an in-gap edge state located near the layer boundary. The system′s 2D TI characters are confirmed by first-principles calculations. The observed gap diminishes with doping by Rb adsorption, ultimately leading to an insulator–semimetal transition. The discovery of this large-gap 2D TI with a tunable band gap opens up opportunities for developing advanced nanoscale systems and quantum devices.

Suggested Citation

  • P. Chen & Woei Wu Pai & Y.-H. Chan & W.-L. Sun & C.-Z. Xu & D.-S. Lin & M. Y. Chou & A.-V. Fedorov & T.-C. Chiang, 2018. "Large quantum-spin-Hall gap in single-layer 1T′ WSe2," Nature Communications, Nature, vol. 9(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04395-2
    DOI: 10.1038/s41467-018-04395-2
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    Cited by:

    1. Junxiang Jia & Elizabeth Marcellina & Anirban Das & Michael S. Lodge & BaoKai Wang & Duc-Quan Ho & Riddhi Biswas & Tuan Anh Pham & Wei Tao & Cheng-Yi Huang & Hsin Lin & Arun Bansil & Shantanu Mukherje, 2022. "Tuning the many-body interactions in a helical Luttinger liquid," Nature Communications, Nature, vol. 13(1), pages 1-7, December.

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