Enhanced charge order in a photoexcited one-dimensional strongly correlated system

TL;DR

This study demonstrates that a transient laser pulse can enhance charge order in a one-dimensional strongly correlated system near a phase boundary, revealing nonequilibrium phenomena with potential experimental applications.

Contribution

The paper introduces a novel nonequilibrium method to induce and analyze charge order enhancement in a low-dimensional correlated system using time-dependent simulations.

Findings

Charge order enhancement occurs near the phase boundary.

Laser frequency and strength tuning are crucial for the effect.

The phenomenon is absent in the Mott insulating phase.

Abstract

We present a compelling response of a low-dimensional strongly correlated system to an external perturbation. Using the time-dependent Lanczos method we investigate a nonequilibrium evolution of the half-filled one-dimensional extended Hubbard model, driven by a transient laser pulse. When the system is close to the phase boundary, by tuning the laser frequency and strength, a sustainable charge order enhancement is found that is absent in the Mott insulating phase. We analyze the conditions and investigate possible mechanisms of emerging charge order enhancement. Feasible experimental realizations are proposed.