Raman imaging and electronic properties of graphene

Details Raman imaging and electronic properties of graphene Raman imaging and electronic properties of graphene

2007-09-21

arxiv.org/abs/0709.3426v1

Advances of Solid State Physics 47, 171 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

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.

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