Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74892
Type: Artigo de periódico
Title: The cumulant expansion of the periodic Anderson model; Completeness and the Phi-derivable approximation
Author: Figueira, MS
Foglio, ME
Abstract: The approximate Green's functions of the localized electrons, obtained by the cumulant expansion of the periodic Anderson model in the Limit of infinite Coulomb repulsion, do not satisfy completeness even for the simplest families of diagrams, like the chain approximation. The idea that employing phi-derivable approximations would solve this difficulty is shown to be false by proving that the chain approximation is phi-derivable and does not satisfy completeness. After finding a family of diagrams with Green's functions that satisfy completeness, we put forward a conjecture that shows how to select families of diagrams with this property.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0953-8984/8/27/012
Date Issue: 1996
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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