A new perspective on the Holstein polaron problem

Details A new perspective on the Holstein polaron problem A new perspective on the Holstein polaron problem

1996-06-12

arxiv.org/abs/cond-mat/9606082v1

Physics

Condensed Matter

4 pages, REVTeX, psfig, 2 postscript figures

Scientific paper

The single-polaron band structure of the Holstein model in one and two dimensions is studied using a new form of resummed strong-coupling perturbation theory. Well converged results are obtained for phonon frequencies of the order of the hopping integral and strong to intermediate electron-phonon coupling. The polaron band structure at intermediate coupling is shown to deviate markedly from that of a nearest-neighbor tight-binding model, and is in fact similar in shape to the prediction of weak-coupling self-consistent perturbation theory.

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