Topological crystalline insulator states in layered materials

ORAL

Abstract

Topological crystalline insulator (TCI) is a topological state of materials whose topological property relies on generic crystalline symmetries. Based on first-principles calculations, we suggest new classes of topological crystalline insulators characterized by non-zero mirror Chern numbers (MCNs) hosted on the mirror-invariant plane at the boundary of the Brillouin zone (BZ). We demonstrate that the new TCI phases can be realized in layered materials, and the topological phase transitions associated with the proposed TCI phases occur under an external pressure. Our results shed light on the role of the MCNs hosted on the surface of the BZ, and open new possibilities for finding TCI materials.

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Authors

  • Youngkuk Kim

    The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania

  • C.L. Kane

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

  • E.J. Mele

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

  • Andrew Rappe

    University of Pennsylvania, Univ of Pennsylvania, The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, The Makineni Theoretical Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6323, USA