Abstract
The two-dimensional (2D) t-T-model is investigated using the functional integration method. The effective action is obtained, and the spectrum of collective Bose-excitations in the superconductive phase of the system is calculated both in the phase-transition vicinity (Ginsburg-Landau region |T−Tc| ≪ Tc) and in the low-temperature region T ≪ Tc. Bibliography: 26 titles.
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