Abstract

Within the dynamical mean field theory (DMFT) the Hubbard model is mapped on a single impurity Anderson model (SIAM), for which the hybridization function has to be determined selfconsistently. But in DMFT treatments of the periodic Anderson model (PAM) unphysical results may be obtained when mapping it on an effective SIAM. Therefore, in a proper DMFT the PAM must be mapped on a two-level effective impurity model so that the DMFT selfconsistency relation becomes a 2 * 2 matrix equation.

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