Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Graphene: Spin-orbit interaction (jointly with DS, HL, MA, and TT)

O 11.6: Vortrag

Montag, 11. März 2013, 12:45–13:00, H17

First-principles study of the spin-orbit interaction in graphene induced by hydrogen adatoms — •Martin Gmitra, Denis Kochan, and Jaroslav Fabian — University of Regensburg

We have performed first principles calculations of the spin-orbit coupling effects in hydrogenated graphene structures, for varying hydrogen coverage densities, using the linearized augmented plane wave method as implemented in the FLEUR code. The covalent bonding between the hydrogen and carbon atoms leads to a local structural puckering of graphene sheets, giving rise to an overlap between the Dirac and sigma electrons and a giant enhancement (from roughly 0.01 to 1 meV) of the local spin-orbit interaction. The calculated effects on the band structure and the emerging spin patterns of the electronic states can be well explained by effective Hamiltonian models derived from group theoretical principles.

This work is supported by the DFG SPP 1285, SFB 689, and GRK 1570.