Comparative study of Weyl semimetal and topological/Chern insulators: Thin-film point of view

Yukinori Yoshimura, Wataru Onishi, Koji Kobayashi, Tomi Ohtsuki, Ken Ichiro Imura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Regarding three-dimensional (3D) topological insulators and semimetals as a stack of constituent two-dimensional (2D) topological (or sometimes nontopological) systems is a useful viewpoint. Here, we perform a comparative study of the paradigmatic 3D topological phases: Weyl semimetal (WSM), strong and weak topological insulators (STI/WTI), and Chern insulator (CI). By calculating the Z and Z2 indices for the thin films of such 3D topological phases, we follow dimensional evolution of topological properties from 2D to 3D. It is shown that the counterparts of STI and WTI in the time-reversal symmetry broken CI system are, respectively, WSM and CI phases. The number ND of helical Dirac cones emergent on the surface of a topological insulator is shown to be identical to the number NW of the pairs of Weyl cones in the corresponding WSM phase: ND=NW. To test the robustness of this scenario against disorder, we have studied the transport property of disordered WSM thin films, taking into account both the bulk and surface contributions.

Original languageEnglish
Article number235414
JournalPhysical Review B
Issue number23
DOIs
Publication statusPublished - 2016 Dec 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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