Strength of effective Coulomb interactions in graphene and graphite

Details Strength of effective Coulomb interactions in graphene and graphite Strength of effective Coulomb interactions in graphene and graphite

2011-01-20

arxiv.org/abs/1101.4007v3

Phys. Rev. Lett. 106, 236805 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures (revised version)

Scientific paper

10.1103/PhysRevLett.106.236805

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.

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