Dresden 2011 – scientific programme
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O: Fachverband Oberflächenphysik
O 98: Graphene VI
O 98.4: Talk
Friday, March 18, 2011, 12:00–12:15, WIL A317
Graphene on lattice-mismatched metal surfaces: STM and ARPES studies — •Hendrik Vita1, Alexander Generalov1, Martin Weser1, Yuriy S Dedkov1, Karsten Horn1, Muriel Sicot2, Philipp Leicht2, Andreas Zusan2, and Mikhail Fonin2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin — 2Universität Konstanz, Department of Physics, Universitätsstraße 10, D-78464 Konstanz
Since metal contacts to graphene are mandatory for potential electronic device applications of graphene, an investigation of graphene/metal interfaces is important. Here we study the electronic structure of graphene in a strongly bonded situation on Rh(111) and compare it to weakly bonded graphene/Ir(111). Angle-resolved photoemission maps of graphene/Ir(111), along the Γ-M-K-Γ direction, exhibit all features attributed to almost free-standing graphene (a Dirac cone with a linear dispersion of the π-band, weak p-doping). The graphene/Rh(111) system, on the other hand demonstrates strong hybridization between graphene band and the Rh 4d valence bands. This leads to pronounced corrugation of the graphene layer as revealed by STM, and a disappearance of the specific electronic band features of graphene. The deposition of thin ferromagnetic metal films on graphene/Ir(111) is also discussed.