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The partition function of a dimer with one electron, interacting with two local Einstein phonons, is reduced to the pure phonon partition function. It is investigated analytically in the coherent-state path-integral representation in order to recognize the competition between electron hopping and electron-phonon interaction. The non-polynomial term in the phonon action, promoted by electron hopping, is deduced. The low-temperature resonance decoupling between electron and phonon systems destroys the low-temperature tendency of electron localization in the case of small hopping and large electron-phonon coupling. The comparison with polaronic theory is completed.
Original language | English |
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Pages (from-to) | 3185-3192 |
Number of pages | 8 |
Journal | Journal of Physics A: Mathematical and General |
Volume | 31 |
Issue number | 14 |
DOIs | |
State | Published - 10 Apr 1998 |
ID: 51232349