Pressure induced Superconductivity in Topological Compound Bi2Te3

Details Pressure induced Superconductivity in Topological Compound Bi2Te3 Pressure induced Superconductivity in Topological Compound Bi2Te3

2010-09-20

arxiv.org/abs/1009.3691v2

Proceedings Nat Aca Sci USA (PNAS) 108(1), 24 ~28(2011)

Physics

Condensed Matter

Superconductivity

Published ahead of print December 20, 2010, doi:10.1073/pnas.1014085108

Scientific paper

10.1073/pnas.1014085108

Bi2Te3 compound has been theoretically predicted (1) to be a topological insulator, and its topologically non-trivial surface state with a single Dirac cone has been observed in photoemission experiments (2). Here we report that superconductivity (Tc^~3K) can be induced in Bi2Te3 as-grown single crystal (with hole-carriers) via pressure. The first-principles calculations show that the electronic structure under pressure remains to be topologically nontrivial, and the Dirac-type surface states can be well distinguished from bulk states at corresponding Fermi level. The proximity effect between superconducting bulk states and Dirac-type surface state could generate Majorana fermions on the surface. We also discuss the possibility that the bulk state could be a topological superconductor.

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