# Photoinduced enhancement of bond-order in the one-dimensional extended Hubbard model

## TL;DR

This study demonstrates how a transient laser pulse can induce bond-order in a one-dimensional extended Hubbard model, revealing a new way to observe electronic bond-ordered waves in molecular crystals.

## Contribution

It shows the photoinduced enhancement of bond-order in a strongly correlated 1D system and links it to in-gap states in optical conductivity, a novel insight into non-equilibrium electronic phases.

## Key findings

- Photoinduced in-gap state appears in optical conductivity.
- Bond-ordered wave can be maximized by tuning pulse parameters.
- Potential for observing electronic bond-ordered waves experimentally.

## Abstract

We investigate the real-time dynamics of the half-filled one-dimensional extended Hubbard model in the strong-coupling regime, when driven by a transient laser pulse. Starting from a wide regime displaying a charge-density wave in equilibrium, a robust photoinduced in-gap state appears in the optical conductivity, depending on the parameters of the pulse. Here, by tuning its conditions, we maximize the overlap of the time-evolving wavefunction with excited states displaying the elusive bond-ordered wave of this model. Finally, we make a clear connection between the emergence of this order and the formation of the aforementioned in-gap state, suggesting the potential observation of purely electronic (i.e., not associated with a Peierls instability) bond-ordered waves in experiments involving molecular crystals.