Geodesic
Diagram technique for the Hubbard model
Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 3, pp. 428-437 Cet article a éte moissonné depuis la source Math-Net.Ru

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A generalized Wick theorem is formulated for the Hubbard model. According to the theorem, the mean value of the time-ordered product of electron operators is represented as a sum of products of single-site cumulants. The theorem is used to construct a diagram technique for the temperature-dependent Green's functions. A Dyson equation for the single-particle Green's function and an expression for the free energy are obtained. 
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M. I. Vladimir; V. A. Moskalenko. Diagram technique for the Hubbard model. Teoretičeskaâ i matematičeskaâ fizika, Tome 82 (1990) no. 3, pp. 428-437. http://geodesic.mathdoc.fr/item/TMF_1990_82_3_a9/

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