Evidence for quantum spin Hall effect in a new van der Waals monolayer

ORAL

Abstract

Inspired by fundamental and technological interest, extensive efforts have been devoted to predicting and identifying high-quality quantum spin Hall (QSH) insulators. The van der Waals (vdW) monolayer TaIrTe4 has been predicted to be a large-gap QSH insulator by first-principles calculations. However, experimental evidence has been so far lacking. Leveraging refined vdW device fabrication techniques, we access the intrinsic quantum electronic properties of monolayer TaIrTe4. In this talk, we report experimental evidence pointing to the QSH effect in the TaIrTe4 monolayer.

* The work was primarily supported by the AFOSR grant FA9550-22-1-0270 and the Center for the Advancement of Topological Materials (CATS), an EFRC funded by DOE, through the Ames Laboratory under contract DEAC02-07CH11358.

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Presenters

  • Jian Tang

    Boston College

Authors

  • Jian Tang

    Boston College

  • Siyuan Ding

    Boston College

  • Hongyu Chen

    Nanyang Technological University

  • Anyuan Gao

    Harvard University

  • Tiema Qian

    University of California, Los Angeles

  • Zumeng Huang

    Boston College

  • Zhe Sun

    Boston College

  • Kenji Watanabe

    National Institute for Materials Science, NIMS, Research Center for Electronic and Optical Materials, National Institute for Materials Science, Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science

  • Takashi Taniguchi

    Kyoto Univ, National Institute for Materials Science, Research Center for Materials Nanoarchitectonics, Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, National Institute for Materials Sciences, NIMS, International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan, National Institute for Material Science, International Center for Materials Nanoarchitectonics, NIMS, Japan, International Center for Materials Nanoarchitectonics, Tsukuba, National Institue for Materials Science, Kyoto University, National Institute of Materials Science, International Center for Materials Nanoarchitectonics and National Institute for Materials Science

  • David C Bell

    Harvard University

  • Ziqiang Wang

    Boston College

  • Liang Fu

    Massachusetts Institute of Technology MI, Massachusetts Institute of Technology, MIT

  • Yang Zhang

    University of Tennessee, Knoxville, University of Tennessee, IAMM HQ, University of Tennessee Knoxville

  • Xiaofeng Qian

    Texas A&M University

  • Kenneth S Burch

    Boston College

  • Youguo Shi

    Chinese Academy of Sciences, Institute of Physics, Chinese Academy of Sciences, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

  • Ni Ni

    University of California, Los Angeles

  • Guoqing Chang

    Nanyang Technological University

  • Suyang Xu

    Harvard University

  • Qiong Ma

    Boston College