Environment-induced decay dynamics of antiferromagnetic order in Mott-Hubbard systems

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 antiferromagnetic order of the Mott-Neel ground state on bipartite lattices decays, even at zero temperature. For zero and nonzero 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.

Automated summary

In this study, we investigate the dissipative Fermi-Hubbard model under weak tunneling and strong repulsive interactions. We find that the Mott insulator property remains stable for cold baths at intermediate chemical potentials, and the particle number relaxes quickly towards half filling. On longer time scales, the antiferromagnetic order of the Mott-Neel ground state on bipartite lattices decays, even at zero temperature. We quantify the different relaxation time scales for zero and nonzero temperatures using waiting time distributions, which can be derived from an effective (non-Hermitian) Hamiltonian.