Document Type

Article

Publication Version

Published Version

Publication Date

6-15-2011

Journal or Book Title

Physical Review B

Volume

83

Issue

24

First Page

241309(R)

DOI

10.1103/PhysRevB.83.241309

Abstract

Ternary tetradymites Bi2Te2S, Bi2Te2Se, and Bi2Se2Te are found to be stable, bulk topological insulators via theory, showing band inversion between group V and VI pz orbitals. We identify Bi2Se2Te as a good candidate to study massive Dirac fermions, with a (111) cleavage-surface-derived Dirac point (DP) isolated in the bulk-band gap at the Fermi energy (Ef)-like Bi2Se3 but with a spin texture alterable by layer chemistry. In contrast, Bi2Te2S and Bi2Te2Se (111) behave like Bi2Te3, with a DP below Ef buried in bulk bands. Bi2Te2S offers large bulk resistivity needed for devices.

Comments

This article is from Phys. Rev. B 83, 541309(R) (2011), doi:10.1103/PhysRevB.83.241309. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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