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TT: Fachverband Tiefe Temperaturen

TT 38: Poster Session Transport

TT 38.32: Poster

Wednesday, March 16, 2011, 14:00–18:00, P3

Influence of adsorbate clustering on transport in graphene nanoribbons — •Sarah Stahl, Georgo Metalidis, and Gerd Schön — Institut für Theoretische Festkörperphysik, Karlsruher Institut für Technologie, D-76128 Karlsruhe

Until now no consensus has been reached on the dominant scattering mechanism in graphene. Several experiments have observed the adsorption of different atoms and molecules on a free-standing graphene surface and imaged the formation of clusters of such adsorbates. Clustering of adsorbates might have a major influence on the transport properties of graphene. In particular, single adsorbates form short-range scattering centers and will thus induce scattering between the two valleys in the graphene Brillouin zone breaking chirality. When they cluster together their scattering is of a longer-range and intervalley scattering will be absent (conserving chirality). We investigate the influence of clustering with a numerical Green's function technique to study the crossover between these two regimes. In particular, we determine the mean free path as a function of the cluster size, ribbon dimensions and disorder strength.