Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)

TT 11.25: Poster

Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d

The modified perturbation treatment of the single impurity Anderson model and its application in dynamical mean-field theory. — •Claas Grenzebach and Gerd Czycholl — Institut für Theoretische Physik, Universität Bremen

The modified perturbation treatment (MPT) of the single impurity Anderson model (SIAM) is an approximation, which is exact up to second order in the Coulomb correlation U and simultaneously reproduces the exactly solvable atomic limit of vanishing hybridization V=0 and the first moments of the spectral function. Recently it has been successfully applied within dynamical mean-field treatments (DMFT) of correlated electron systems, in particular heavy fermion systems. In this contribution we investigate the properties and limitations of the MPT in some detail by applying it to non-trivial but exactly solvable models like the two-site SIAM. Results of DMFT/MPT calculations for heavy fermion systems are also presented.