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Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.107: Poster

Friday, April 4, 2014, 10:30–13:30, P2

Hybridization between surface and bulk electronic structure of the topological insulator Sb2Te3(0001) — •Henriette Maaß1,2, Christoph Seibel1,2, Hendrik Bentmann1,2, Kazuyuki Sakamoto3, Kenya Shimada4, and Friedrich Reinert1,21Experimentelle Physik VII, Universität Würzburg, D-97074 Würzburg — 2Gemeinschaftslabor für Nanoanalytik, Karlsruher Institut für Technologie KIT, D-76021 Karlsruhe — 3Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan — 4Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-0046, Japan

We investigated the surface band structure of the topological insulator Sb2Te3(0001) with respect to bulk and surface contributions using photon energy dependent angle-resolved photoelectron spectroscopy (ARPES) and spin-resolved ARPES. Our results render direct evidence for a spin-orbit split trivial surface state which shows a Rashba-type character for small k but develops an unusual connecting behavior with bulk states for larger k in accordance with theoretical predictions. Our findings on the topological surface state (TSS) indicate a coexistence with bulk states in the valence band regime without considerable hybridization, unlike previous results on the isostructural materials Bi2Se3(0001) and Bi2Te3(0001). On the other hand we find a photon energy dependance of the TSS at higher binding energies which points to a k-dispersion and an increasing bulk character.
Seibel et al. PRB 86, 161105(R) (2012)

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