Abstract
A two-level Bose-system interacting with a multimode Fermi-field is considered. The path integration method is used to obtain the spectrum of the collective excitations below the phase transition point in the superradiant state. The question of phase transition stability is investigated.
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Literature cited
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Additional information
Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 101, pp. 184–195, 1981.
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Fedotov, S.A. Phase transition in a model two-level system. J Math Sci 23, 2487–2494 (1983). https://doi.org/10.1007/BF01084177
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DOI: https://doi.org/10.1007/BF01084177