Ternary Tetradymite Compounds as Topological Insulators

Details Ternary Tetradymite Compounds as Topological Insulators Ternary Tetradymite Compounds as Topological Insulators

2010-12-17

arxiv.org/abs/1012.3974v3

PRB 83, 241309 (2011)

Physics

Condensed Matter

Materials Science

12 pages, 3 figures and 1 table

Scientific paper

10.1103/PhysRevB.83.241309

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.

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