Renormalization of hopping integrals due to Coulomb interactions for the Anderson model.

Gunnarsson O., Schonhammer K.

The authors study the renormalization of hopping integrals between localized and delocalized levels due to a Coulomb interaction between these two types of levels. They find that the renormalization enhances the effective hopping matrix elements, due to effects of the type that enhance X-ray spectra at the threshold. This effect tends to make the hopping integrals appear larger for thermodynamic properties than for spectroscopic properties.

Physical Review B, 40 4160-3, 1989.

Max-Planck Institut für Festkörperforschung;
Postfach 80 06 65   D-70506 Stuttgart