Strongly Gapped Topological Surface States in MnBi<sub>2</sub>Te<sub>4</sub>(Bi<sub>2</sub>Te<sub>3</sub>)<sub>n</sub> Family

ORAL

Abstract

The MnBi2Te4(Bi2Te3)n family of materials are potential candidates for magnetic topological insulators (MTIs) that may show the Quantum Anomalous Hall Effect (QAHE). This class of materials are heterostructures of MnBi2Te4 and Bi2Te3 layers that are stacked together via van der Waals forces, with n number of Bi2Te3 layers interstitially placed between MnBi2Te4 layers. In this talk, we present Angular Resolved Photoemission Spectroscopy (ARPES) experiments on MnBi4Te7, MnBi6Te10, and MnBi8Te13, demonstrating the topological nature of each material. Furthermore, we deconvolve the surface spectra due to each possible surface termination for each stacking arrangement, demonstrating a rich transition from the gapless MnBi2Te4 surface, through a gapped Bi2Te3-like surface, and ending with an approximate pure Bi2Te3 surface.

*Work at CU Boulder was supported by NSF-DMR 1534734, work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0011978. Work at SUSTech was supported by the NSFC under Grant No. 11874195. This work was supported partially by the MOST, Taiwan, Grant MOST107-2627-E-006-001.

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Presenters

  • Kyle Gordon

    • University of Colorado, Boulder
    • Physics, University of Colorado-Boulder

Authors

  • Kyle Gordon

    • University of Colorado, Boulder
    • Physics, University of Colorado-Boulder

  • Chaowei Hu

    • Physics, University of California, Los Angeles
    • Physics and Astronomy, UCLA
    • Physics and Astronomy, Univerisity of California, Los Angeles
    • University of California, Los Angeles
    • Department of Physics and Astronomy and California NanoSystems Institute, University of California
    • Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA
    • University of California Los Angeles

  • Pengfei Liu

    • Physics, Shenzhen Institute for Quantum Science and Technology
    • Physics, Southern University of Science and Technology
    • Department of Physics, Southern University of Science and Technology

  • Barun Ghosh

    • Physics, Indian Institute of Technology-Kanpur

  • Andrew Linn

    • University of Colorado, Boulder

  • Haoxiang Li

    • University of Colorado, Boulder

  • Dushyant Narayan

    • University of Colorado, Boulder

  • Jinyu Liu

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

  • Hongyi Sun

    • Physics, Shenzhen Institute for Quantum Science and Technology
    • Southern University of Science and Technology
    • Department of Physics, Southern University of Science and Technology

  • Bahadur Singh

    • Northeastern University
    • Physics, Northeastern University
    • SZU-NUS Collaborative Center, ShenZhen University
    • Department of Physics, Northeastern University

  • Amit Agarwal

    • Physics, Indian Institute of Technology-Kanpur

  • Suyang Xu

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT
    • Physics, Massachusetts Institute of Technology
    • Harvard university
    • Harvard University
    • Havard University

  • Hsin Lin

    • Academia Sinica
    • Physics, Academia Sinica
    • Institute of Physics, Academia Sinica, Taipei, Taiwan
    • Institute of Physics, Academia Sinica

  • Tay-Rong Chang

    • National Cheng Kung University
    • Physics, National Cheng Kung University
    • Department of Physics, National Cheng Kung University
    • National Cheng Kung University, Taiwan

  • Qihang Liu

    • physics, Southern University of Science and Technology
    • Physics, Shenzhen Institute for Quantum Science and Technology
    • Physics, Southern University of Science and Technology
    • Southern University of Science and Technology
    • Department of Physics, Southern University of Science and Technology

  • Ni Ni

    • Univ of California Los Angeles
    • Physics, University of California, Los Angeles
    • Physics and Astronomy, UCLA
    • Department of Physics and Astronomy, University of California Los Angeles
    • University of California, Los Angeles
    • Department of Physics and Astronomy and California NanoSystems Institute, University of California
    • Department of Physics and Astronomy and California Nano Systems Institute, University of California, Los Angeles, CA 90095, USA
    • University of California Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Daniel Dessau

    • Department of Physics, University of Colorado Boulder
    • University of Colorado, Boulder
    • Physics, University of Colorado-Boulder