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SM ISO690:2012 MOSKALENKO, Vsevolod, ENTEL, Peter, DIGOR, Dumitru. Strong interaction of correlated electrons with acoustical phonons using the extended Hubbard-Holstein model. In: Physical Review B - Condensed Matter and Materials Physics, 2006, vol. 74, p. 0. ISSN 1098-0121. DOI: https://doi.org/10.1103/PhysRevB.74.075109 |
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Physical Review B - Condensed Matter and Materials Physics | ||||||
Volumul 74 / 2006 / ISSN 1098-0121 /ISSNe 1550-235X | ||||||
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DOI:https://doi.org/10.1103/PhysRevB.74.075109 | ||||||
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We investigate the interaction of correlated electrons with acoustical phonons using the extended Hubbard-Holstein model. The Lang-Firsov canonical transformation allows us to obtain mobile polarons for which a diagram technique and generalized Wick’s theorem is used. In the strong-coupling limit of the electron-phonon interaction, and in the normal as well as in the superconducting phase, chronological thermodynamical averages of products of acoustical phonon-cloud operators can be expressed by one-cloud propagators. The pairing of electrons in the presence of acoustical phonon clouds is discussed and the critical temperature of the superconducting phase transition is determined for the special case U<0, where U is the renormalized value of the on-site Coulomb repulsion. The renormalization is caused by the electron-phonon interaction. |
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Cuvinte-cheie Conduction Electrons, Perturbation Expansion, electron |
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