Ultrafast light-induced long range antiferromagnetic correlations in paramagnets

TL;DR

This paper introduces a laser-driven method to create long-range antiferromagnetic correlations in paramagnets, achieving exponentially larger correlation lengths than traditional adiabatic methods, with dynamics mapped to a solvable free fermion model.

Contribution

The authors develop a non-adiabatic laser protocol for long-range order in paramagnets and identify optimal parameters for maximizing correlation length and cluster size.

Findings

Correlation lengths exponentially larger than adiabatic schemes.

Resonant cluster dynamics mapped to free fermions.

Optimal driving parameters for maximal correlations.

Abstract

We propose and analyze a laser-driven protocol to generate long-range ordered patterns in paramagnets, based on non-adiabatically driven aggregation dynamics. We derive the optimal driving parameters that maximize, respectively, the correlation length or the size of defect-free antiferromagnetic clusters in a one-dimensional chain. We show that one can reach correlation lengths that are exponentially larger than those achieved by adiabatic pumping schemes. The resonantly driven dynamics of cluster fronts is shown to map to an exactly solvable model of free fermions.