[hal-00000442] Dynamical mean field theory of small polaron transport

We present a unified view of the transport properties ofsmall-polarons in the Holstein model at low carrier densities,based on the Dynamical Mean Field Theory.The nonperturbative nature of the approach allows us to study thecrossover from classical activated motion at high temperatures tocoherent motion at low temperatures.Large quantitative discrepancies from the standard polaronicformulae are found. The scaling properties of the resistivity are analysed, anda simple interpolation formula is proposed in the nonadiabaticregime.



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