Two-site polaron problem: a perturbation approach with variational basis states

Details Two-site polaron problem: a perturbation approach with variational basis states Two-site polaron problem: a perturbation approach with variational basis states

1999-05-26

arxiv.org/abs/cond-mat/9905373v2

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages (LATEX), 3 postscript figures (prn files), revised manuscript, new references added

Scientific paper

10.1142/S0217979299004070

A convergent perturbation method using modified Lang Firsov transformation is developed for a two-site single-polaron system. The method is applicable for the entire range of the electron-phonon coupling strength from the antiadiabatic limit to the intermediate region of hopping. The single-electron energies, oscillator wave functions and correlation functions, calculated using this method, are in good agreement with the exact results.

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