Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 32: Spin-Orbit Interaction at Surfaces II

O 32.3: Talk

Tuesday, March 15, 2011, 11:45–12:00, WIL C307

The Rashba-Bychkov model in a simple sp-band tight binding framework — •Christian R. Ast, Isabella Gierz, and Klaus Kern — MPI für Festkörperforschung, Stuttgart

The Rashba-Bychkov model has been remarkably successful in describing the lifted spin-degeneracy of two-dimensional states at surfaces and interfaces. A more detailed description has been given by Petersen and Hedegård with a p-band tight-binding model accounting for the atomic spin-orbit coupling as well as an asymmetric orbital overlap resulting from the potential gradient perpendicular to the surface [1]. Here, we present an extension of this model by including other orbitals. In this way, contributions of the potential gradient originating from within an atom as well as from neighboring atoms become evident. The results will be applied to the model system graphene.

[1] L. Petersen and P. Hedegård, Surf. Sci. 459, 49 (2000)