Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 26: Transport: Graphene and Carbon Nanotubes

TT 26.10: Talk

Wednesday, March 25, 2009, 16:45–17:00, HSZ 03

Conductance of graphene ribbons in the presence of chemical adsorbates — Petra Dietl¹, •Georgo Metalidis¹, Pablo San-Jose^1,2, Dmitri Golubev¹, Elsa Prada^1,2, Henning Schomerus², and Gerd Schön¹ — ¹Institut für Theoretische Festkörperphysik and DFG-Center for Functional Nanostructures, Universität Karlsruhe, D-76128 Karlsruhe, Germany — ²Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom

Chemical adsorbates on a graphene sheet have a large influence on its transport properties, making graphene a candidate system for chemical sensors. The influence of adsorbates on the graphene conductivity is twofold. On one hand they can dope the graphene sheet, thus increasing its conductance, while on the other hand the adsorbates form scattering centers that will decrease the conductance. We have investigated the interplay between these competing effects and observed some interesting properties, one of them being an extremely long localization length for certain types of adsorbates.