Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.42: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Local transport properties of epitaxially grown graphene — •Frederik Edler1, Jens Baringhaus1, Christoph Neumann2, Christoph Stampfer2, Stiven Forti3, Ulrich Starke3, and Christoph Tegenkamp1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 2JARA-FIT and II. Institute of Physics A, RWTH Aachen University, 52074 Aachen, Germany — 3Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany
Transport properties of graphene are strongly affected by imperfections. A promising approach to large-scale graphene films which could be used in electronic circuits or new device structures is the epitaxial growth of graphene on SiC. For a better understanding of defect parameters, the epitaxial growth of graphene on a 6H-SiC(0001) substrate was stopped before the completion of large scale graphene areas which results in patches of different graphene perfection and transport regimes. By means of a four-tip STM/SEM system we were able to gently contact our sample on a nanometer scale without inducing strain to the graphene films. This allowed us to correlate the local morphology of monolayer graphene (as seen in SEM and STM images) with spatially resolved transport measurements. Further supporting spectroscopic characterizations were done by ARPES, Raman and STS measurements. Our detailed analysis of temperature dependency and variation of probe spacings clearly reveals two-dimensional transport regimes of Anderson localization as well as diffusive transport.