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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 37: MLT: Poster Session

TT 37.23: Poster

Donnerstag, 25. März 2010, 14:00–18:00, Poster A

Work function engineering and doping of graphene — •Burkhard Sachs1, Tim Wehling1, Alexander Lichtenstein1, and Mikhail Katsnelson211. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, D-20355 Hamburg, Germany — 2Institute for Molecules and Materials, Radboud University Nijmegen, NL-6525 AJ Nijmegen, The Netherlands

Realistic graphene samples are always subject to external perturbations, e.g., impurities, adsorbates or strains. We investigate doping effects on graphene originating from molecular adsorbates and strains by using density functional theory calculations. The impact of work function variations on real graphene devices is discussed and compared to other doping mechanisms, including chiral midgap states for monovalent adsorbates. Screening effects for adsorbate induced dipole moments are considered with the example of water molecules.

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