Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 92: Topological Insulators I (jointly with MA, DS, HL, O)
TT 92.4: 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.