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Quantum electron transport in ternary transition metal chalcogenide TaIrTe<sub>4</sub>

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.



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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