Quantum electron transport in ternary transition metal chalcogenide TaIrTe4

ORAL

Abstract

Pristine topological van der Waals (vdW) crystals are exciting material platforms to study topology in a highly-tunable way. Ternary transition metal chalcogenides MM’X4 (M = Nb, Ta and M′ = Ir, Rh) are expected to show rich topological characters: In 3D they are type-II Weyl semimetals with long Fermi arcs; In 2D they are topological insulators (TI) with sizable topological gaps. Particularly bilayer TaIrTe4 is predicted to be a non-centrosymmetric 2D TI with intrinsic ferroelectric ordering. Despite the interest, the studies on thin-layer TaIrTe4 have been very limited due to their air-sensitive nature. We successfully fabricated dual-gated monolayer and bilayer TaIrTe4 devices. The number of layers and stacking configuration were confirmed by cross-section TEM measurements. We performed electron transport experiments to study their topological and correlated properties. In this talk, we report on our experimental observations of these devices.



*The work was supported as part of the Center for the Advancement of Topological Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science.

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Presenters

  • Jian Tang

    • Boston College

Authors

  • Jian Tang

    • Boston College

  • Siyuan Ding

    • Boston College
    • Department of Physics, Boston College

  • Yong Li

    • Institute of Physics, Chinese Academy of Sciences

  • Tiema Qian

    • University of California, Los Angeles

  • Anyuan Gao

    • Harvard University

  • Kenji Watanabe

    • National Institute for Materials Science
    • Research Center for Functional Materials, National Institute of Materials Science
    • Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • NIMS
    • Research Center for Functional Materials, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • Takashi Taniguchi

    • National Institute for Materials Science
    • Kyoto Univ
    • International Center for Materials Nanoarchitectonics, National Institute of Materials Science
    • Kyoto University
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-044, Japan
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science
    • National Institute for Materials Science, Japan
    • National Institute For Materials Science
    • NIMS
    • National Institute for Material Science
    • International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Tsukuba, Japan
    • NIMS Japan

  • David C Bell

    • Harvard University
    • Havard University

  • Kenneth S Burch

    • Boston College

  • Youguo Shi

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

  • Ni Ni

    • University of California, Los Angeles
    • University of California, Los Angeles, Los Angeles

  • Suyang Xu

    • Harvard University

  • Xiaofeng Qian

    • Texas A&M University

  • Qiong Ma

    • Boston College