SAMOP 2023 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 37: Quantum Many Body Systems
QI 37.4: Vortrag
Freitag, 10. März 2023, 15:15–15:30, F428
Reviving product states in the disordered Heisenberg chain — •Henrik Wilming1, Tobias J. Osborne1, Kevin S.C. Decker2, and Christoph Karrasch2 — 1Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 2Technische Universität Braunschweig, Institut für Mathematische Physik, Mendelssohnstraße 3, 38106
When a generic quantum system is prepared in a simple initial condition, it typically equilibrates toward a state that can be described by a thermal ensemble. A known exception are localized systems which are non-ergodic and do not thermalize, however local observables are still believed to become stationary. Here we demonstrate that this general picture is incomplete by constructing product states which feature periodic high-fidelity revivals of the full wavefunction and local observables that oscillate indefinitely. The system neither equilibrates nor thermalizes. This is analogous to the phenomenon of weak ergodicity breaking due to many-body scars and challenges aspects of the current MBL phenomenology, such as the logarithmic growth of the entanglement entropy. To support our claim, we combine analytic arguments with large-scale tensor network numerics for the disordered Heisenberg chain. Our results hold for arbitrarily long times in chains of 160 sites up to machine precision.