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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.

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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