Geodesic
Dynamic spin susceptibility in the Hubbard model
Teoretičeskaâ i matematičeskaâ fizika, Tome 113 (1997) no. 1, pp. 124-138

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By employing a new diagram technique developed for systems with strong correlations, the dynamic spin susceptibility for the Hubbard model is calculated. The single-site interaction is allowed for in the zero-order approximation, while electron hopping is taken into account by the evolutoin operator. We consider the second order of the perturbation theory and calculate the sum of the two-particle single-site ladder-type diagrams that are irreducible. Equations determinig the static susceptebility and spin wave spectrum are obtained. 
@article{TMF_1997_113_1_a10,
     author = {V. A. Moskalenko and N. M. Plakida},
     title = {Dynamic spin susceptibility in the {Hubbard} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {124--138},
     publisher = {mathdoc},
     volume = {113},
     number = {1},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_113_1_a10/}
}
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V. A. Moskalenko; N. M. Plakida. Dynamic spin susceptibility in the Hubbard model. Teoretičeskaâ i matematičeskaâ fizika, Tome 113 (1997) no. 1, pp. 124-138. http://geodesic.mathdoc.fr/item/TMF_1997_113_1_a10/