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HL: Fachverband Halbleiterphysik

HL 67: Topological insulators I (MA with HL/TT)

HL 67.4: Vortrag

Donnerstag, 19. März 2015, 10:15–10:30, EB 202

Spin structure of the Dirac state of the topological insulator Bi₂Te₃(0001) — •Christoph Seibel¹, Henriette Maaß¹, Hendrik Bentmann¹, Jürgen Braun², Jan Minár², Taichi Okuda³, and Friedrich Reinert¹ — ¹Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg — ²Department Chemie, Physikalische Chemie, Universität München, Butenandtstrasse 5-13, D-81337 München — ³Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan

Three-dimensional topological insulators feature non-trivial surface states in the fundamental band gap of the bulk. In particular, the spin texture of these topological surface states (TSS) attracts attention in the context of possible applications in spintronics. We have performed angle- and spin-resolved photoemission measurements to analyze the three-dimensional spin texture of the TSS of the topological insulator Bi₂Te₃. The measured photoelectron spin-polarization is found to significantly deviate from the anticipated ground-state spin texture of the TSS, as derived e.g. on the basis of first-principles calculations. Possible origins of our observations are discussed in terms of the influence of spin-orbit coupling on the photoemission process. We compare our experimental data to the results of fully relativistic one-step photoemission calculations.