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Article overview
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Z2 invariant protected bound states in topological insulators | | Wen-Yu Shan
; Jie Lu
; Hai-Zhou Lu
; Shun-Qing Shen
; | | Date: |
4 Oct 2010 | | Abstract: | We present an exact solution of a modifed Dirac equation for topological
insulator in the presence of a hole or vacancy to demonstrate that vacancies
may induce bound states in the band gap of topological insulators. They arise
due to the Z_2 classification of time-reversal invariant insulators, thus are
also topologically-protected like the edge states in the quantum spin Hall
effect and the surface states in three-dimensional topological insulators.
Coexistence of the in-gap bound states and the edge or surface states in
topological insulators suggests that imperfections may affect transport
properties of topological insulators via additional bound states near the
system boundary. | | Source: | arXiv, 1010.0503 | | Services: | Forum | Review | PDF | Favorites | |
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