Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: TR: Graphene 2 (jointly with MA, HL, and DY)
TT 8.12: Talk
Monday, March 14, 2011, 17:00–17:15, HSZ 304
Color-dependent conductance of graphene with adatoms — •Jörg Schelter1, Pavel Ostrovsky2,3, Igor Gornyi2,4, Björn Trauzettel1, and Mikhail Titov2,5 — 1Institut für Theoretische Physik und Astrophysik, University of Würzburg, 97074 Würzburg, Germany — 2Institut für Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — 3L. D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia — 4A. F. Ioffe Physico-Technical Institute, 194021 St. Petersburg, Russia — 5School of Engineering & Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
We study ballistic transport properties of graphene with a low concentration of vacancies or adatoms. The conductance of graphene doped to the Dirac point is found to depend on the relative distribution of impurities among different sites of the honeycomb lattice labeled in general by six colors. The conductivity is shown to be sensitive to the crystal orientation if adatom sites have a preferred color. Our theory is confirmed by numerical simulations using recursive Green’s functions with no adjustable parameters.