Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Electronic Structure and Spin-Orbit Interaction I
O 21.8: Vortrag
Montag, 11. März 2013, 17:45–18:00, H42
Electronic structure and photoemission of topological insulators — •Jürgen Braun, Jan Minar, and Hubert Ebert — Dept. Chemie und Biochemie, LMU Universität München, Germany
We discuss calculated spectral features of Bi2Te3, Bi2Se3 and Sb2Te3 and compare with corresponding experimental data. In detail, the dependence of the CDAD on the photon energy is identified as a final state effect. Furthermore, a complete calculation of the spin-polarization vector including the component perpendicular to the surface is presented. Also the behavior of Rashba split surface resonances which had been observed at higher binding energies is analysed. Last but not least the unoccupied bulk and surface states of these materials are investigated by use of our one-step photoemission theory. The calculations have been performed in the framework of the fully relativistic version of the one-step model that is part of the Munich SPR-KKR program package [1]. To guarantee for a quantitative description of the surface-sensitive spectral features special attention is payed to the image-potential behavior of the surface barrier, which is included as an additional layer in the photoemission formalism.
1. H. Ebert et al., The Munich SPR-KKR package, version 6.3, http://olymp.cup.uni-muenchen.de/ak/ebert/SPRKKR (2012).