Dresden 2011 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: TR: Graphene 2 (jointly with MA, HL, and DY)
TT 8.2: Vortrag
Montag, 14. März 2011, 14:15–14:30, HSZ 304
Resonant Scattering by Realistic Impurities in Graphene — •Tim Wehling1, Shengjun Yuan2, Alexander Lichtenstein1, Andre Geim3, and Mikhail Katsnelson2 — 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, D-20355 Hamburg, Germany — 2Radboud University of Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands — 3School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
We develop a first-principles theory of resonant impurities in graphene and show that a broad range of typical realistic impurities leads to the characteristic sublinear dependence of the conductivity on the carrier concentration. By means of density functional calculations various organic groups as well as adatoms such as H absorbed to graphene are shown to create midgap states within ± 0.03 eV around the neutrality point. A low energy tight-binding description is mapped out. Boltzmann transport theory as well as a numerically exact Kubo formula approach yield the conductivity of graphene contaminated with these realistic impurities in accordance with recent experiments. Consequences for spin-flip scattering are discussed.