Electronic compressibility of a graphene bilayer
Journal Article

Published: Wednesday, March 12, 2008
Citation: Physical Review Letters, Volume 100, Pages 106805

Authors (4 total): J. Nilsson, D. K. Campbell, A. Castro Neto, S. Viola Kusminskiy

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.