Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 85: Topological Insulators 2 (MA with HL/TT)
HL 85.1: Vortrag
Donnerstag, 19. März 2015, 15:00–15:15, EB 202
Topological surface states of Heusler-type topological insulators — •Shu-Chun Wu1, Binghai Yan1,2, and Claudia Felser1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Max Planck Institute for Physics of the Complex Systems, Dresden, Germany
Some promising half-Heusler compounds, RPtBi (R = La, Lu, Y), are demonstrated experimentally to be superconductors and are predicted to be topological insulators. The topological feature of bulk is band inversion and the s orbital of Pt atom is the main clue. However, their topological surface states (TSSs) remain unclear. In this work, we use ab initio method to investigate the TSSs. In experiment, they are found at the Γ point inside the valence bands. Spin texture is also calculated to confirm the topologically nontrivial surface states. External strain can push the TSSs from the valence bands up into gap.