Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.22: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Role of hybridization for the emergence of a giant Rashba effect in graphene — •Dmitry Marchenko1, Andrei Varykhalov1, Markus R. Scholz1, Oliver Rader1, Gustav Bihlmayer2, Artem Rybkin3, Anna Popova3, Alexander M. Shikin3, Emmanuel I. Rashba4, and Thomas Seyller5 — 1Helmholtz-Zentrum Berlin — 2Forschungszentrum Jülich — 3St. Petersburg State University — 4Harvard University — 5Universität Erlangen-Nürnberg
We have recently created a giant Rashba splitting (100 meV) [1] of the Dirac fermions at the Fermi energy of graphene by intercalation of Au and attributed it to the high spin-orbit interaction in Au. Ab initio calculations and spin- and angle-resolved photoemission spectra of the interaction of graphene π with Au d states show a delicate dependence on the details of the hybridization which are not present in other systems. A giant Rashba splitting (200 meV) reported recently for graphene grown on SiC [2] is not confirmed by our measurements giving an upper limit of ∼10 meV. Moreover, we compare to the intercalation system graphene/Au/SiC.
[1] D. Marchenko, A. Varykhalov, M. R. Scholz, E. I. Rashba, G. Bihlmayer, A. Rybkin, M. A. Shikin, O. Rader, unpublished [2] I. Gierz et al., arXiv:1004.1573v1