期刊
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
卷 245, 期 2, 页码 421-427出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssb.200743311
关键词
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We review the Luttinger-Ward method and show how one can combine it with the thory of Baym and Kadanoff in order to get conserving approximations in many-body perturbation theory. We solve the variation procedure numerically using an ansatz for the selfenergy in the case of the two-dimensional Coulomb problem. Comparison with results of the traditional iteration of the selfconsistency equation yields satisfactory agreement for parameters where the iteration converges. The extremalization of the Luttinger-Ward functional works beyond that point.
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