Geodesic
On the existence of superconductivity in the Hubbard model
Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 16-30 Cet article a éte moissonné depuis la source Math-Net.Ru

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A generalized Wick theorem is proposed for the superconducting phase of the single-band Hubbard model, and a thermodynamic diagram technique taking into account the strong electron correlations of the system is developed. An exact Dyson equation is obtained for the single-particle Green's function and an approximate equation for the correlation twoparticle Green's function. On this basis, a dynamical system of equations that determines the superconducting phase of the Hubbard model is formulated. 
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N. N. Bogolyubov; V. A. Moskalenko. On the existence of superconductivity in the Hubbard model. Teoretičeskaâ i matematičeskaâ fizika, Tome 86 (1991) no. 1, pp. 16-30. http://geodesic.mathdoc.fr/item/TMF_1991_86_1_a1/

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