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 Maaß^1,2, Christoph Seibel^1,2, Hendrik Bentmann^1,2, Kazuyuki Sakamoto³, Kenya Shimada⁴, and Friedrich Reinert^1,2 — ¹Experimentelle 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)