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TT: Fachverband Tiefe Temperaturen
TT 23: Correlated Electrons: (General) Theory
TT 23.2: Talk
Wednesday, February 27, 2008, 14:15–14:30, H 0104
Bath-symmetries and hybridization sum-rules for CDMFT and DCA — •Erik Koch1, Giorgio Sangiovanni2, and Olle Gunnarsson2 — 1Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich — 2Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart
In the Hamiltonian formulation of CDMFT and DCA, the point symmetries of the cluster imply symmetries of the hybridization, which can substantially reduce the number of independent parameters to fit the bath Green function. We review these symmetries and derive general sum-rules for the hybridizations, which (i) allow to check the quality of a fit using a finite set of bath sites and (ii) imply what hybridizations vanish. As examples we discuss calculations for the Hubbard model in one-dimension and for 2× 2 clusters.