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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 Yan1,21Max 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 abinitio calculations. Two distinct TI phases emerge: one phase is due to the band inversion between Bip and Nas bands, and the other phase (under pressure) is induced by the inverted Bip and Bad 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 pd inverted phase. NaBaBi presents a prototype model for TIs that exhibit different spin textures in the same material.

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DPG-Physik > DPG-Verhandlungen > 2015 > Berlin