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 in close vicinity to the critical value separating conducting graphene from an insulating phase emphasizing the importance of nonlocal Coulomb terms. The nearest-neighbor Coulomb interaction strength is computed to . In the long-wavelength limit, we find the effective background dielectric constant of graphite to be in very good agreement with experiment.
- Received 25 January 2011
DOI:https://doi.org/10.1103/PhysRevLett.106.236805
© 2011 American Physical Society