Photoinduced prethermal order parameter dynamics in the two-dimensional large-$N$ Hubbard-Heisenberg model

TL;DR

This paper investigates how pulsed electric fields influence the dynamics of competing ordered phases in a two-dimensional large-$N$ Hubbard-Heisenberg model, revealing frequency-dependent control over prethermal states and phase transitions.

Contribution

It introduces a large-$N$ generalization combined with a semiclassical truncated Wigner approximation to study non-mean-field, light-induced phase dynamics in correlated electrons.

Findings

Post-pulse order depends on driving frequency and field direction.

Transition between phases occurs at similar energies in low- and high-frequency regimes.

An intermediate frequency regime minimizes heating during phase transition.

Abstract

We study the microscopic dynamics of competing ordered phases in a two-dimensional correlated electron model, which is driven with a pulsed electric field of finite duration. In order to go beyond a mean-field treatment of the electronic interactions we adopt a large-$N$ generalization of the Hubbard model and combine it with the semiclassical fermionic truncated Wigner approximation as a time evolution method. This allows us to calculate dephasing corrections to the mean-field dynamics and to obtain stationary states, which we interpret as prethermal order. We use this framework to simulate the light-induced transition between two competing phases (bond density wave and staggered flux) and find that the post-pulse stationary state order parameter values are not determined alone by the amount of absorbed energy but depend explicitly on the driving frequency and field direction. While the transition between the two prethermal phases takes place at similar total energies in the low- and high-frequency regimes, we identify an intermediate frequency regime for which it occurs with minimal heating.