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Single-polaron band structure of the Holstein model

1996; American Physical Society; Volume: 54; Issue: 13 Linguagem: Inglês

10.1103/physrevb.54.8981

1095-3795

W. Stephan,

Cold Atom Physics and Bose-Einstein Condensates

The single-polaron band structure of the Holstein model in one and two dimensions is studied using 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. \textcopyright{} 1996 The American Physical Society.