We study the dynamics of screening in photo-doped Mott insulators with long-ranged interactions using a nonequilibrium implementation of the GW plus extended dynamical mean field theory (GW+EDMFT) formalism. Our study demonstrates that the complex interplay of the injected carriers with bosonic degrees of freedom (charge fluctuations) can result in long-lived transient states with properties that are distinctly different from those of thermal equilibrium states. Systems with strong nonlocal interactions are found to exhibit a self-sustained population inversion of the doublons and holes. This population inversion leads to low-energy antiscreening which can be detected in time-resolved electron-energy loss spectra.
@article{arxiv.1702.04952,
title = {Nonequilibrium GW+EDMFT: Antiscreening and inverted populations from nonlocal correlations},
author = {Denis Golez and Lewin Boehnke and Hugo Strand and Martin Eckstein and Philipp Werner},
journal= {arXiv preprint arXiv:1702.04952},
year = {2017}
}