Exciton-polaron formation in one-dimensional lattice models with short or long-range carrier-phonon interaction is studied by quantum Monte Carlo simulations. Depending on the relative sign of electron and hole-phonon coupling, the exciton-polaron size increases or decreases with increasing interaction strength. Quantum phonon fluctuations determine the (exciton-)polaron size and yield translation-invariant states at all finite couplings.
@article{arxiv.0709.3424,
title = {Lattice exciton-polaron problem by quantum Monte Carlo simulations},
author = {Martin Hohenadler and Peter B. Littlewood and Holger Fehske},
journal= {arXiv preprint arXiv:0709.3424},
year = {2007}
}