Optical absorption and activated transport in polaronic systems
arXiv:cond-mat/0505447 · doi:10.1103/PhysRevB.72.104304
Abstract
We 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 figures