Electronic compressibility of a graphene bilayer
Strongly Correlated Electrons
2008-04-01 v3
Abstract
We calculate the electronic compressibility arising from electron-electron interactions for a graphene bilayer within the Hartree-Fock approximation. We show that, due to the chiral nature of the particles in this system, the compressibility is rather different from those of either the two-dimensional electron gas or ordinary semiconductors. We find that an inherent competition between the contributions coming from intra-band exchange interactions (dominant at low densities) and inter-band interactions (dominant at moderate densities) leads to a non-monotonic behavior of the compressibility as a function of carrier density.
Cite
@article{arxiv.0706.2359,
title = {Electronic compressibility of a graphene bilayer},
author = {S. Viola Kusminskiy and Johan Nilsson and D. K. Campbell and A. H. Castro Neto},
journal= {arXiv preprint arXiv:0706.2359},
year = {2008}
}