Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 46: Graphene - SiC Substrates and Intercalation (jointly with DS, HL, MA, and O)
TT 46.13: Talk
Wednesday, March 13, 2013, 19:00–19:15, H17
Intercalated thin films on Graphene/Ir(111) — •Hendrik Vita1, Stefan Böttcher1, Yuriy S Dedkov2, and Karsten Horn1 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin — 2SPECS Surface Nano Analysis GmbH, Voltastr. 5, D-13355 Berlin
The investigation of graphene/metal systems is interesting from fundamental as well as applications-oriented point of view. Here we report on the interaction of weakly and strongly bound intercalated metals (Cu vs. Ni) with graphene grown on Ir(111), using core and valence level photoemission spectroscopy. Studying the electronic structure of graphene in these interfaces reveals the effect of weak and strong interaction between graphene and the underlying intercalated thin film. The graphene/Ni/Ir(111) system shows a strong hybridization between the graphene π-band and the Ni 3d valence bands, which leads to the destruction of the graphene Dirac cone. The graphene/Cu/Ir(111) system, on the other hand, shows at first glance the properties of weakly bonded graphene (Dirac cone with a linear dispersion of the π-band) but with additional doping due to the donation of electrons by the intercalated Cu. Contrary to the weakly bonded scenario we observe a hybridization between the distinct Cu3d states and the graphene π-band.