%0 Journal Article
%T Raman imaging and electronic properties of graphene
%A F. Molitor
%A D. Graf
%A C. Stampfer
%A T. Ihn
%A K. Ensslin
%J Physics
%D 2007
%I arXiv
%R 10.1007/978-3-540-74325-5_14
%X Graphite is a well-studied material with known electronic and optical properties. Graphene, on the other hand, which is just one layer of carbon atoms arranged in a hexagonal lattice, has been studied theoretically for quite some time but has only recently become accessible for experiments. Here we demonstrate how single- and multi-layer graphene can be unambiguously identified using Raman scattering. Furthermore, we use a scanning Raman set-up to image few-layer graphene flakes of various heights. In transport experiments we measure weak localization and conductance fluctuations in a graphene flake of about 7 monolayer thickness. We obtain a phase-coherence length of about 2 $\mu$m at a temperature of 2 K. Furthermore we investigate the conductivity through single-layer graphene flakes and the tuning of electron and hole densities via a back gate.
%U http://arxiv.org/abs/0709.3426v1