SKM 2023 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 25: Many-Body Quantum Dynamics (joint session DY/TT)
DY 25.9: Vortrag
Mittwoch, 29. März 2023, 12:00–12:15, MOL 213
Environment-induced decay dynamics of antiferromagnetic order in Mott-Hubbard systems — •Gernot Schaller1, Friedemann Queisser1,2, Nikodem Szpak3, Jürgen König3, and Ralf Schützhold1,2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden, Germany — 3Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany
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-Néel 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.
[1] G. Schaller et al., Phys. Rev. B 105, 115139 (2022).