Department of Physics Papers

Document Type

Journal Article

Date of this Version

3-7-2007

Comments

Suggested Citation:
L. Fu, C.L. Kane and E.J. Mele. (2007). Topological Insulators in Three Dimensions. Physical Review Letters 98, 106803.

© 2007 The American Physical Society
http://dx.doi.org/10.1103/PhysRevLett.98.106803

Abstract

We study three-dimensional generalizations of the quantum spin Hall (QSH) effect. Unlike two dimensions, where a single Z2 topological invariant governs the effect, in three dimensions there are 4 invariants distinguishing 16 phases with two general classes: weak (WTI) and strong (STI) topological insulators. The WTI are like layered 2D QSH states, but are destroyed by disorder. The STI are robust and lead to novel ‘‘topological metal’’ surface states. We introduce a tight binding model which realizes the WTI and STI phases, and we discuss its relevance to real materials, including bismuth.

 

Date Posted: 18 May 2011

This document has been peer reviewed.