The effect of the SiO2 substrate on a graphene film is investigated using realistic but computationally convenient energy-optimized models of the substrate supporting a layer of graphene. The electronic bands are calculated using density-functional methods for several model substrates. This provides an estimate of the substrate-charge effects on the behaviour of the bands near EF, as well as a variation of the equilibrium distance of the graphene sheet. A model of a wavy graphene layer is examined as a possible candidate for understanding the nature of the minimally conducting states in graphene.
@article{arxiv.cond-mat/0703094,
title = {Electronic structure and the minimum conductance of a graphene layer on SiO2 from density-functional methods.},
author = {M. W. C. Dharma-wardana},
journal= {arXiv preprint arXiv:cond-mat/0703094},
year = {2007}
}