Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Graphene II
O 27.7: Vortrag
Dienstag, 27. März 2012, 12:00–12:15, MA 041
Visualizing quantum interference nearby individual magnetic impurities on graphene — T. Eelbo1, M. Gyamfi1, S. Forti2, U. Starke2, •M. Waśniowska1, and R. Wiesendanger1 — 1Institute 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.