# Dynamical sign reversal of magnetic correlations in dissipative Hubbard models

## TL;DR

This paper demonstrates that inelastic interactions in the Hubbard model can reverse magnetic correlations dynamically, offering a new method to control quantum magnetism using dissipation in ultracold atomic systems.

## Contribution

It reveals how dissipation from inelastic collisions can fundamentally reverse magnetic correlations in Hubbard models, applicable to both fermionic and bosonic systems.

## Key findings

- Dissipation causes sign reversal of magnetic correlations.
- Applicable to fermionic and bosonic Mott insulators.
- Detection feasible with optical lattice and quantum-gas microscopy.

## Abstract

In quantum magnetism, the virtual exchange of particles mediates an interaction between spins. Here, we show that an inelastic Hubbard interaction fundamentally alters the magnetism of the Hubbard model due to dissipation in spin-exchange processes, leading to sign reversal of magnetic correlations in dissipative quantum dynamics. This mechanism is applicable to both fermionic and bosonic Mott insulators, and can naturally be realized with ultracold atoms undergoing two-body inelastic collisions. The dynamical reversal of magnetic correlations can be detected by using a double-well optical lattice or quantum-gas microscopy, the latter of which facilitates the detection of the magnetic correlations in one-dimensional systems because of spin-charge separation. Our results open a new avenue toward controlling quantum magnetism by dissipation.