Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 69: Electronic structure I

O 69.5: Talk

Thursday, March 17, 2011, 12:15–12:30, WIL C107

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

Circular dichroism in the angular distribution (CDAD) refers to the difference of the measured photocurrent for right and left circularly polarized light. To observe this effect either the target has to be chiral or the experimental geometry has a defined handedness. The CDAD signal is dependent on the geometry of the setup, the orbital composition of the initial state and the relative phases of the partial waves in the final state.

Different surface alloys on Ag(111) and also graphene have been investigated with circularly polarized light and the CDAD signal has been measured. We compare the experimental data for the different systems to the theoretical description of CDAD by Schönhense [1] and estimate the orbital composition of the initial state.

[1] G. Schönhense, Phys. Scr., T31, 255, (1990)