Abstract
It is shown that an essential aspect in the study of polarons, which belong to multiparticle systems, is a correct selection of the Fock space from a manifold of unitarily inequivalent representations. Using the quantum field theory, we have studied a single-site polaron model with an allowance for the electron correlations at a lattice site. This model takes into account the formation of a charged site boson state in addition to the single-particle fermion states. It is demonstrated that, provided the initial site sates are half-occupied, the formation of boson-polaron mixed site states takes place. The thermodynamics of these states is considered.
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Translated from Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, Vol. 119, No. 4, 2001, pp. 763–776.
Original Russian Text Copyright © 2001 by Agafonov, Manykin.
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Agafonov, A.I., Manykin, É.A. Boson-fermion mixed site states. J Exp Theor Phys 92, 665–676 (2001). https://doi.org/10.1134/1.1371348
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DOI: https://doi.org/10.1134/1.1371348