Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.43: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

Inhomogeneous electronic properties of monolayer graphene on Ru(0001) — •Mike Gyamfi, Thomas Eelbo, Marta Waśniowska, and Roland Wiesendanger — Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, 20355 Hamburg

Understanding properties of the interface between graphene and a metal surface has recently gained considerable attention. In case of Ru(0001) the linear dispersion of monolayer graphene is not preserved due to the hybridization between C and Ru orbitals at the interface [1]. In order to get access to the electronic structure inside the Moiré pattern of graphene we performed spatially resolved STS at low temperature. We report on direct evidences for variations of the electronic properties regarding the exact position of the carbon atoms with respect to Ru atoms and the corrugation within the subunit cell. The shape of dI/dU spectra is quite similar on all parts of the Moiré pattern, the spectra differ only by a slight shift, ΔE = 30 meV, of the peak position at -0.4 eV and its intensity. This small energy difference is related to the carbon and Ru atoms’ hybridization upon growth of graphene on the Ru surface. A detailed analysis revealed that the dominant peak at -0.4 eV originates from a d-like Ru bulk state.

[1] T. Brugger et al., Phys. Rev. B 79, 045407 (2009)