Abstract
A generalization of perturbational studies of the Anderson model to the case of finite Coulomb repulsionU between the localized electrons is presented. We evaluate one particle spectra for the impurity and the lattice case. When varyingU, systematic trends in the peak positions and in the dynamic energy scale are obtained, which agree well with intuitive expectations. The results provide an understanding of the Anderson model in the full range of its parameters to the same extent as was previously furnished by the NCA approach to theU=∞ case.
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This work was performed within the research program of SFB 252 “Elektronisch hochkorrelierte metallische Materialien”
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Pruschke, T., Grewe, N. The Anderson model with finite Coulomb repulsion. Z. Physik B - Condensed Matter 74, 439–449 (1989). https://doi.org/10.1007/BF01311391
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DOI: https://doi.org/10.1007/BF01311391