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Superconducting State in the Lagrangian Formalism of the Generalized Hubbard Model

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Abstract

The nonperturbative large-N expansion applied to the generalized Hubbard model describing N-fold-degenerate correlated bands is considered. Our previous results, obtained in the framework of the Lagrangian formalism for the normal-state case, are extended to the superconducting state. The standard Feynman diagrammatics is obtained and the renormalized physical quantities are computed and analyzed. Our purpose is to obtain the 1/N corrections to the renormalized boson and fermion propagators when a state with Cooper-pair condensation (i.e., the superconducting state) is considered.

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Authors and Affiliations

  1. Facultad de Ciencias Exactas Ingeniería y Agrimensura de la UNR, Av. Pellegrini 250, 2000, Rosario, Argentina

    O. S. Zandron

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  1. O. S. Zandron
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Zandron, O.S. Superconducting State in the Lagrangian Formalism of the Generalized Hubbard Model. International Journal of Theoretical Physics 42, 2103–2113 (2003). https://doi.org/10.1023/A:1027351523184

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  • DOI: https://doi.org/10.1023/A:1027351523184

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