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HL: Fachverband Halbleiterphysik

HL 85: Topological Insulators 2 (MA with HL/TT)

HL 85.2: Vortrag

Donnerstag, 19. März 2015, 15:15–15:30, EB 202

Topological surface states on NaBaBi with two opposite spin textures — •Yan Sun¹, Shu-Chun Wu¹, Claudia Felser¹, and Binghai Yan^1,2 — ¹Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany. — ²Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany.

By breaking the inversion symmetry of the 3D Dirac metal Na₃Bi, we realize topological insulator (TI) phases in a known compound NaBaBi using ab−initio calculations. Two distinct TI phases emerge: one phase is due to the band inversion between Bi−p and Na−s bands, and the other phase (under pressure) is induced by the inverted Bi−p and Ba−d bands. Both phases exhibit Dirac-cone-type surface states, but opposite spin textures. In the upper cone, a left-hand spin texture exists for the s-p inverted phase (similar to a common TI, e.g. Bi₂Se₃) while a right-hand spin texture appears for the p−d inverted phase. NaBaBi presents a prototype model for TIs that exhibit different spin textures in the same material.