A new perspective on the Holstein polaron problem

Walter Stephan

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arXiv · cond-mat/9606082

A new perspective on the Holstein polaron problem

Walter Stephan

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Abstract

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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Walter Stephan. 1996-06-12. A new perspective on the Holstein polaron problem. https://arxiv.org/abs/cond-mat/9606082

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