Many-body theory of degenerate systems: A simple example

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The hierarchy of Green functions for (quasi)degenerate systems, presented in cond-mat/0308058, is calculated in detail for the case of a system with closed shells plus a single electron in a two-fold degenerate level. The complete hierarchy is derived explicitly, in terms of Green functions and of Feynman diagrams.
9 pages, 1 figure

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/22863

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0312158
 http://arxiv.org/abs/cond-mat/0312158

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arXiv