Strength of effective Coulomb interactions in graphene and graphite
Mesoscale and Nanoscale Physics
2015-03-17 v3 Materials Science
Strongly Correlated Electrons
Abstract
To obtain an effective many-body model of graphene and related materials from first principles we calculate the partially screened frequency dependent Coulomb interaction. In graphene, the effective on-site (Hubbard) interaction is U_00 = 9.3 eV in close vicinity to the critical value separating conducting graphene from an insulating phase emphasizing the importance of non-local Coulomb terms. The nearest-neighbor Coulomb interaction strength is computed to U_01 = 5.5 eV. In the long wavelength limit, we find the effective background dielectric constant of graphite to be \epsilon = 2.5 in very good agreement with experiment.
Keywords
Cite
@article{arxiv.1101.4007,
title = {Strength of effective Coulomb interactions in graphene and graphite},
author = {T. O. Wehling and E. Sasioglu and C. Friedrich and A. I. Lichtenstein and M. I. Katsnelson and S. Blügel},
journal= {arXiv preprint arXiv:1101.4007},
year = {2015}
}
Comments
4 pages, 3 figures (revised version)