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Strength of Effective Coulomb Interactions in Graphene and Graphite

Strength of Effective Coulomb Interactions in Graphene and Graphite,10.1103/PhysRevLett.106.236805,Physical Review Letters,T. O. Wehling,E. Sasioglu,C

Strength of Effective Coulomb Interactions in Graphene and Graphite  
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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 U00=9.3eV 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 U01=5.5eV. In the long-wavelength limit, we find the effective background dielectric constant of graphite to be ε=2.5 in very good agreement with experiment.
Journal: Physical Review Letters - PHYS REV LETT , vol. 106, 2011
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