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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 Katsnelson² — ¹1. 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.