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Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Graphene II

O 27.7: Talk

Tuesday, March 27, 2012, 12:00–12:15, MA 041

Visualizing quantum interference nearby individual magnetic impurities on grapheneT. Eelbo1, M. Gyamfi1, S. Forti2, U. Starke2, •M. Waśniowska1, and R. Wiesendanger11Institute of Applied Physics, University of Hamburg, Jungiusstr. 11, D-20355Hamburg — 2Max Planck Institute for Solid State Research, Heisenbergstr. 1, D-70569 Stuttgart, Germany

The presence of impurities or defects on graphene and their influence on the electronic properties of graphene is an important aspect for next generation electronic devices. On the one hand intrinsic defects on graphene have already been widely studied, on the other hand extrinsic defects, such as adatoms are currently under theoretical and experimental study. We report on the local density of states of graphene in the presence of Co adatoms investigated by scanning tunneling microscopy/spectrocopy. The interaction of an individual Co adatom with graphene modifies the electronic structure over a distance of 1 nm around the adatom, leading to a (√3 × √3)R30 superstructure in the local density of states. The observed features of this wave pattern are consistent with the electronic intervalley scattering predicted to occur at adatoms’ sites.

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