Environment-induced decay dynamics of anti-ferromagnetic order in Mott-Hubbard systems

TL;DR

This paper investigates how anti-ferromagnetic order in Mott-Hubbard systems decays under environmental dissipation, revealing different relaxation timescales and providing analytic solutions for specific lattice configurations.

Contribution

It introduces an analytic framework to describe environment-induced decay of magnetic order in dissipative Fermi-Hubbard models, including explicit solutions for tetramer rings.

Findings

Mott insulator remains stable at intermediate chemical potentials.

Anti-ferromagnetic order decays over time, even at zero temperature.

Analytic expressions derived for relaxation dynamics on a tetramer ring.

Abstract

We study the dissipative Fermi-Hubbard model in the limit of weak tunneling and strong repulsive interactions, where each lattice site is tunnel-coupled to a Markovian fermionic bath. For cold baths at intermediate chemical potentials, the Mott insulator property remains stable and we find a fast relaxation of the particle number towards half filling. On longer time scales, we find that the anti-ferromagnetic order of the Mott-N\'eel ground state on bi-partite lattices decays, even at zero temperature. For zero and non-zero temperatures, we quantify the different relaxation time scales by means of waiting time distributions which can be derived from an effective (non-Hermitian) Hamiltonian and obtain fully analytic expressions for the Fermi-Hubbard model on a tetramer ring.