Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 57: Focused Session: Spin-Orbit Interaction at Surfafces: From the Rashba Effect to Topological States of Matter II

O 57.5: Vortrag

Donnerstag, 26. März 2009, 16:45–17:00, HSZ 02

Relativistic effects in the surface emission of layered intermetallic systems — •Jurgen Braun, Jan Minar, Sven Bornemann und Hubert Ebert — Dep. Chemie und Biochemie, LMU München, Germany

In the framework of the fully relativistic version of the one-step model, the photoemission intensities resulting from layered intermetallic thin films will be presented. The electronic structure as well as the photoemission calculations have been performed for true semi-infinite systems using the upgraded version of the Munich SPR-KKR program package [1]. To guarantee for a quantitative description of the surface-sensitive spectral distribution special attention is payed on the image-potential behavior of the surface barrier, which is included as an additional layer in the photoemission formalism [2]. Here, we show the intensity distributions that result by excitation with ultraviolet radiation from Ag/Au(111), Ag/Au(110) and Au/Ni(111) surfaces. We discuss the variation in binding energy and spin-orbit splitting of the corresponding surface states as a function of the overlayer thickness and compare our results with available experimental data.

1. H. Ebert et al., The munich SPR-KKR package, version 3.6, http://olymp.cup.uni-muenchen.de/ak/ebert/SPRKKR (2008).

2. A. B. Schmidt et al., J. Phys. D: Appl. Phys. 41 164003 (2008).