Abstract
TheN-fold degenerate Anderson single impurity model in the infiniteU limit is treated by means of the irreducible Green functions method. In this approach a derivation of an exact Dyson equation and an exact self-energy operator is possible. The necessity of introducing auxiliary fields, such as slave-bosons is avoided.
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Petrů, J. Self-consistent treatment of the Anderson model. Z. Physik B - Condensed Matter 91, 351–356 (1993). https://doi.org/10.1007/BF01344064
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DOI: https://doi.org/10.1007/BF01344064