We study quenches of the interaction and electron-phonon coupling parameter in the Hubbard-Holstein model, using nonequilibrium dynamical mean field theory. The calculations are based on a generalized Lang-Firsov scheme for time-dependent interactions or externally driven phonons, and an approximate strong-coupling impurity solver. The interaction quench calculations reveal the phonon-assisted decay of excess doublons, while the quenches of the electron-phonon coupling lead to persistent oscillations of the phonons and to a phonon-enhanced doublon production.
@article{arxiv.1307.8096,
title = {Phonon-enhanced relaxation and excitation in the Holstein-Hubbard model},
author = {Philipp Werner and Martin Eckstein},
journal= {arXiv preprint arXiv:1307.8096},
year = {2013}
}