Quantum Hall Effect in Quasi-One-Dimensional Weak Topological Insulator

ORAL

Abstract

Prototypical weak topological insulators (WTI) have been theoretically predicted to be realized in quasi-one-dimensional materials Bi4X4 (X = Br, I) [PRL 116, 066801 (2016)] and then experimentally confirmed in ARPES [Nature (London) 566, 518 (2019)]. The unique surface states of such a WTI have two entangled Dirac cones with strong anisotropy. We study theoretically the integer quantum Hall effect of such WTI surface states and show the important roles played by the special geometry, symmetry, topology, and their interplay in Bi4X4. We also predict prominent signatures in transport experiments.

*This theoretical work at UTD was supported by National Science Foundation under Grant No. DMR-1921581 through the DMREF program and Army Research Office under Grant No. W911NF-18-1-0416.

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Presenters

  • Tianyi Xu

    • University of Texas at Dallas

Authors

  • Tianyi Xu

    • University of Texas at Dallas

  • Patrick Cheung

    • University of Texas at Dallas

  • Fengcheng Wu

    • University of Maryland, College Park
    • Argonne National Laboratory
    • Physics, University of Maryland
    • Condensed Matter Theory Center, Joint Quantum Institute, and Department of Physics, University of Maryland College Park

  • Fan Zhang

    • University of Texas at Dallas
    • Department of Physics, The University of Texas at Dallas
    • University of Texas, Dallas
    • Department of Physics, University of Texas at Dallas