Prediction of weak topological insulators in layered semiconductors

Binghai Yan, Lukas Müchler, Claudia Felser

Research output: Contribution to journalArticlepeer-review

86 Scopus citations

Abstract

We report the discovery of weak topological insulators by abinitio calculations in a honeycomb lattice. We propose a structure with an odd number of layers in the primitive unit cell as a prerequisite for forming weak topological insulators. Here, the single-layered KHgSb is the most suitable candidate for its large bulk energy gap of 0.24eV. Its side surface hosts metallic surface states, forming two anisotropic Dirac cones. Although the stacking of even-layered structures leads to trivial insulators, the structures can host a quantum spin Hall layer with a large bulk gap, if an additional single layer exists as a stacking fault in the crystal. The reported honeycomb compounds can serve as prototypes to aid in the finding of new weak topological insulators in layered small-gap semiconductors.

Original languageEnglish (US)
Article number116406
JournalPhysical review letters
Volume109
Issue number11
DOIs
StatePublished - Sep 13 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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