# Nonequilibrium GW+EDMFT: Antiscreening and inverted populations from nonlocal correlations

## TL;DR

This paper investigates how nonlocal correlations affect screening dynamics in photo-excited Mott insulators, revealing phenomena like population inversion and antiscreening through a nonequilibrium GW+EDMFT approach.

## Contribution

It introduces a nonequilibrium GW+EDMFT method to study long-range interaction effects in photo-doped Mott insulators, highlighting the emergence of antiscreening and inverted populations.

## Key findings

- Long-lived transient states with nonthermal properties.
- Population inversion of doublons and holes in systems with strong nonlocal interactions.
- Detection of antiscreening via time-resolved electron-energy loss spectra.

## Abstract

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.