Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 55: Electronic Structure and Spin-Orbit Interaction II

O 55.2: Talk

Wednesday, March 13, 2013, 16:15–16:30, H42

Single Dirac-cone on the Cs-covered topological insulator surface Sb₂Te₃(0001) — •Christoph Seibel^1,2, Hendrik Bentmann^1,2, Henriette Maass^1,2, Sebastian Fiedler^1,2, Christian Junger^1,2, Chul-Hee Min^1,2, Kazuyuki Sakamoto³, Friedrich Reinert^1,2, and Kenya Shimada⁴ — 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

In contrast to more prominent topological insulator (TI) materials like Bi₂Te₃ and Bi₂Se₃ the surface electronic structure of naturally p-type Sb₂Te₃ is comparably unexplored. Using angle-resolved photoelectron spectroscopy (ARPES) we measured the occupied electronic structure of clean and Cs-covered Sb₂Te₃(0001). The surface-doping-induced band bending results in a non-rigid shift of the electronic valence band features leaving the Dirac-point right above the Fermi-level. The influence of the adatoms is compared to effects of metal adsorption on other TI surfaces. Furthermore we identify a trivial, Rashba-split surface state by photon-energy-dependent ARPES and studied its spin-character using spin-resolved ARPES.