Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.43: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Spin Splitting Mechanism in Surface Alloys investigated by Circular Dichroism in the Angular Distribution of Photoelectrons — •Carola Straßer, Isabella Gierz, Hadj-Mohamed Benia, Klaus Kern, and Christian R. Ast — MPI für Festkörperforschung, Stuttgart

Circular dichroism in the angular distribution (CDAD) of photoelectrons refers to the difference of the measured photocurrent for right and left circularly polarized light. The CDAD signal contains information about the photoemission process and is determined by the experimental geometry, the orbital composition of the initial state and also the relative phase between different final state partial waves.

We used an ARPES (angular resolved photoemission spectroscopy) setup with different light polarizations and applied this technique to the band structure of two surface alloys on the Ag(111) surface with different spin splitting. Both systems show a clear CDAD signal but variant features. To get more information about the spin splitting mechanism we combined tight binding calculations with general theoretical descriptions of CDAD to explain the characteristic patterns in the experimental data.