Phys. Rev. B 50, 12156–12159 (1994)Partition functions for strongly correlated fermion systemsReceived 1 July 1994; published in the issue dated 15 October 1994 Utilizing the grand canonical partition function as well as the cumulant summation formula, we consider a systematic approximation scheme for a strongly correlated fermion system. As an example, we investigate the single-impurity Anderson model. We are motivated by the fact that for this model there are physical aspects to the approximations used that are simply understood. In particular the lowest-order truncation yields the Kondo temperature as well as a many-particle understanding of the approximation of Zwicknagl, Zevin, and Fulde to the f spectral function. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.50.12156
DOI:
10.1103/PhysRevB.50.12156
PACS:
05.30.Fk, 75.20.Hr
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