First-principles study of the nonsymmorphic Dirac insulator

ORAL

Abstract

Recently, we have found a novel topological crystalline insulator phase, referred to as the nonsymmorphic Dirac Insulator [1]. Unlike the time-reversal Z2 topological insulator, the nonsymmorphic Dirac insulator is a characterized by a single four-fold degenerate Dirac point, occurring on the p4g or pgg invariant surface of the otherwise band insulator. Inthis talk, we will present our first-principles study to find the material realization of the nonsymmorphic Dirac insulator. After introducing a general scheme to calculate the Z4XZ2 topological invariants using the symmetry-labeled Wilson loop calculations, we show Sr2Pb3 can host the (2,2) phase, hosting a single four-fold degenerate Dirac on the (001) surface.

[1] Wieder, Benjamin J., Barry Bradlyn, Zhijun Wang, Jennifer Cano, Youngkuk Kim, Hyeong-Seok D. Kim, A. M. Rappe, C. L. Kane, and B. Andrei Bernevig. "Wallpaper Fermions and the Topological Dirac Insulator." arXiv preprint arXiv:1705.01617 (2017).

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Presenters

  • Youngkuk Kim

    Sungkyunkwan University, Physics, Sungkyunkwan University, Department of Physics, Sungkyunkwan University(SKKU), Department of Chemistry, University of Pennsylvania, Physics, Sungkyunkwan Univ

Authors

  • Benjamin Wieder

    Princeton University, Physics, Princeton

  • Barry Bradlyn

    Princeton Center for Theoretical Science, Princeton University, Princeton Center for Theoretical Science, Princeton University, Center for Theoretical Science, Princeton University, Physics, Princeton

  • Zhijun Wang

    Physics, Princeton University, Princeton University, Department of Physics, Princeton University, Physics, Princeton

  • Jennifer Cano

    Princeton Center for Theoretical Science, Princeton University, Princeton Center for Theoretical Science, Physics, Princeton University, Princeton University, Center for Theoretical Science, Princeton University, Physics, Princeton

  • Youngkuk Kim

    Sungkyunkwan University, Physics, Sungkyunkwan University, Department of Physics, Sungkyunkwan University(SKKU), Department of Chemistry, University of Pennsylvania, Physics, Sungkyunkwan Univ

  • Hyeong-Seok Kim

    Physics, University of Pennsylvania

  • Andrew Rappe

    Univ of Pennsylvania, Chemistry, University of Pennsylvania, Chemistry, Univ of Pennsylvania, Department of Chemistry, University of Pennsylvania

  • Charles Kane

    Univ of Pennsylvania, Department of Physics and Astronomy, University of Pennsylvania, Physics, University of Pennsylvania

  • Andrei Bernevig

    Physics Department, Princeton University, Department of Physics, Princeton University, Physics Department, Princeton Univ, Physics, Princeton University, Princeton University, Physics, Princeton