The unusual transport properties of graphene are the direct consequence of a peculiar bandstructure near the Dirac point. We determine the shape of the pi bands and their characteristic splitting, and the transition from a pure 2D to quasi-2D behavior for 1 to 4 layers of graphene by angle-resolved photoemission. By exploiting the sensitivity of the pi bands to the electronic potential, we derive the layer-dependent carrier concentration, screening length and strength of interlayer interaction by comparison with tight binding calculations, yielding a comprehensive description of multilayer graphene's electronic structure.
@article{arxiv.cond-mat/0612173,
title = {Interlayer interaction and electronic screening in multilayer graphene},
author = {Taisuke Ohta and Aaron Bostwick and J. L. McChesney and Thomas Seyller and Karsten Horn and Eli Rotenberg},
journal= {arXiv preprint arXiv:cond-mat/0612173},
year = {2007}
}