We report measurements of the electronic structure and surface morphology of exfoliated graphene on an insulating substrate using angle-resolved photoemission and low energy electron diffraction. Our results show that although exfoliated graphene is microscopically corrugated, the valence band retains a massless fermionic dispersion, with a Fermi velocity of ~10^6 m/s. We observe a close relationship between the morphology and electronic structure, which suggests that controlling the interaction between graphene and the supporting substrate is essential for graphene device applications.
@article{arxiv.0806.0355,
title = {Spectro-microscopy of single and multi-layer graphene supported by a weakly interacting substrate},
author = {Kevin R. Knox and Shancai Wang and Alberto Morgante and Dean Cvetko and Andrea Locatelli and Tevfik Onur Mentes and Miguel Angel Niño and Philip Kim and R. M. Osgood},
journal= {arXiv preprint arXiv:0806.0355},
year = {2009}
}