Topological Insulators at Room Temperature

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

Topological insulators are new states of quantum matter with surface states protected by the time-reversal symmetry. In this work, we perform first-principle electronic structure calculations for $Sb_2Te_3$, $Sb_2Se_3$, $Bi_2Te_3$ and $Bi_2Se_3$ crystals. Our calculations predict that $Sb_2Te_3$, $Bi_2Te_3$ and $Bi_2Se_3$ are topological insulators, while $Sb_2Se_3$ is not. In particular, $Bi_2Se_3$ has a topologically non-trivial energy gap of $0.3 eV$, suitable for room temperature applications. We present a simple and unified continuum model which captures the salient topological features of this class of materials. These topological insulators have robust surface states consisting of a single Dirac cone at the $Γ$ point.
5 pages, 4 figures

Keywords

Mesoscale and Nanoscale Physics, Materials Science

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/210023

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0812.1622
 http://arxiv.org/abs/0812.1622

Collections

arXiv