Correlation functions for composite operators in the Hubbard model

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We compute the correlation functions for antiferromagnetic and d-wave superconducting fermion bilinears in a generalized mean field type approximation for the Hubbard model. For high temperature our explicit expressions show that homogeneous field configurations are preferred for these composite bosons. Below a critical temperature we find spontaneous symmetry breaking with homogeneous expectation values of the composite fields. Our results can be used to device a nonperturbative flow equation for the exploration of the low temperature regime.
29 pages, 5 figures

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Strongly Correlated Electrons, Superconductivity, High Energy Physics - Theory

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http://salesiana.dossiersoluciones.com/handle/123456789/18049

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0107390
 http://arxiv.org/abs/cond-mat/0107390

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arXiv