Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 15: Spin-Orbit Interaction at Surfaces II

O 15.1: Talk

Monday, March 22, 2010, 15:00–15:15, H38

Graphene with strong extrinsic spin-orbit effects: an ab-initio study — •Gustav Bihlmayer and Stefan Blügel — Institut für Festkörperforschung & Institute for Advanced Simulation, Forschungszentrum Jülich, 52425 Jülich, Germany

Recent experimental investigations of Au-intercalated graphene on Ni(111) reported strong spin-orbit (SO) induced splittings in the spectrum near the K-point [1]. Theoretical studies of a model Hamiltonian for graphene with extrinsic SO coupling predict an unusual spectrum and spin-orientation pattern for this case [2].

We present first principles calculations of this system, basically confirming the scenario developed in [2], but including effects from the realistic materials, e.g. modifications due to the substrate. Our calculations show quantitative agreement with the experimental results [1]. Moreover, the complex interplay of the nickel’s exchange field and Rashba-type SO-fields (induced by the intercalated Au monolayer) is analysed and compared to other cases, e.g. the Rashba-split surface state of the Gd(0001) surface [3].

[1] A. Varykhalov et al., Phys. Rev. Lett. 101, 157601 (2008)

[2] E. I. Rashba, Phys. Rev. B 79, 161409(R) (2009)

[3] O. Krupin et al., Phys. Rev. B 71, 201403(R) (2005)