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Collective excitations in the superconducting phase of the one-band Hubbard model

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Abstract

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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Authors
  1. V. N. Popov
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  2. P. A. Sevast'yanov
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deceased

St. Petersburg Branch, V. A. Steklov Mathematics Institute, Russian Academy of Sciences. Translated from Teoreticheskaya i Metematicheskaya Fizika, Vol. 102, No. 3, pp. 457–462, March, 1995.

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Popov, V.N., Sevast'yanov, P.A. Collective excitations in the superconducting phase of the one-band Hubbard model. Theor Math Phys 102, 331–335 (1995). https://doi.org/10.1007/BF01017883

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  • DOI: https://doi.org/10.1007/BF01017883

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