Coulomb integrals and model Hamiltonians for C60

V.P. Antropov, O. Gunnarsson and O. Jepsen
Max-Planck-Institut für Festkörperforschung, Stuttgart

The effective on-site Coulomb interaction U and the nearest neighbor interaction V for a C60 solid are calculated. We obtain U=0.8-1.3 eV and V=0.3-0.5 eV. The photoemission spectrum for a finite Hubbard chain is calculated and an appreciable broadening of the spectrum is found for these parameters, due to many-body effects.

Phys. Rev. B (Rapid Commun.) 46, 13647 (1992).

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