# Producing Coherent Excitations in Pumped Mott Antiferromagnetic Insulators

## TL;DR

This paper uses nonperturbative simulations to explore how ultrafast laser pulses can manipulate charge and spin excitations in a Mott antiferromagnetic insulator, revealing the role of Floquet states and spectral modifications.

## Contribution

It introduces a detailed simulation approach linking transient states to many-body excitations in correlated materials under realistic pump conditions.

## Key findings

- Resonance of virtual states with the upper Hubbard band enables control of electronic distributions.
- Interactions cause spectral weight transfer, affecting charge and spin excitations.
- Transient dynamics are connected to the nature of many-body excitations in the material.

## Abstract

Nonequilibrium dynamics in correlated materials has attracted attention due to the possibility of characterizing, tuning, and creating complex ordered states. To understand the photoinduced microscopic dynamics, especially the linkage under realistic pump conditions between transient states and remnant elementary excitations, we performed nonperturbative simulations of various time-resolved spectroscopies. We used the Mott antiferromagnetic insulator as a model platform. The transient dynamics of multi-particle excitations can be attributed to the interplay between Floquet virtual states and a modification of the density of states, in which interactions induce a spectral weight transfer. Using an autocorrelation of the time-dependent spectral function, we show that resonance of the virtual states with the upper Hubbard band in the Mott insulator provides the route towards manipulating the electronic distribution and modifying charge and spin excitations. Our results link transient dynamics to the nature of many-body excitations and provide an opportunity to design nonequilibrium states of matter via tuned laser pulses.