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.

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Presenters

  • Kyle Gordon

    • University of Colorado, Boulder

Authors

  • Kyle Gordon

    • University of Colorado, Boulder

  • Chaowei Hu

    • University of California, Los Angeles
    • Physics, University of California, Los Angeles
    • Physics and Astronomy Department, University of California, Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Hongyi Sun

    • Physics, Shenzhen Institute for Quantum Science and Technology

  • Garrison Linn

    • University of Colorado, Boulder

  • Bryan Berggren

    • University of Colorado, Boulder

  • Tay-Rong Chang

    • Physics, National Cheng Kung University

  • Qihang Liu

    • Physics, Shenzhen Institute for Quantum Science and Technology

  • Ni Ni

    • University of California, Los Angeles
    • Physics, University of California, Los Angeles
    • Physics and Astronomy Department, University of California, Los Angeles
    • Department of Physics and Astronomy, University of California, Los Angeles

  • Daniel Dessau

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