Geodesic
Сollective excitations in the superconductive phase of the one-band Hubbard model
Teoretičeskaâ i matematičeskaâ fizika, Tome 102 (1995) no. 3, pp. 457-462 
V. N. Popov; P. A. Sevastianov. Сollective excitations in the superconductive phase of the one-band Hubbard model. Teoretičeskaâ i matematičeskaâ fizika, Tome 102 (1995) no. 3, pp. 457-462. http://geodesic.mathdoc.fr/item/TMF_1995_102_3_a10/
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     author = {V. N. Popov and P. A. Sevastianov},
     title = {{\CYRS}ollective excitations in the superconductive phase of the one-band {Hubbard} model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1995_102_3_a10/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

The method of functional integration is used to investigate the collective excitations in the superconducting state of the one-band two-dimensional Hubbard model with repulsion. The energy spectrum of the Bose modes is obtained. The existence of a branch of Bogolyubov sound is demonstrated. The phase structure and symmetry of the model are also considered.

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