2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/95011We present exact results for the optical response in the one-dimensional Holstein model. In particular, by means of a refined kernel polynomial method, we calculate the ac and dc electrical conductivities at finite temperatures for a wide parameter range of electron phonon interaction. We analyze the deviations from the results of standard small polaron theory in the intermediate coupling regime and discuss non-adiabaticity effects in detail.7 pages, 8 figuresStrongly Correlated Electronstext