Regensburg 2019 – wissenschaftliches Programm
DY 9.2: Vortrag
Montag, 1. April 2019, 15:45–16:00, H19
Prethermalization and typical response of weakly perturbed quantum many-body systems — •Lennart Dabelow and Peter Reimann — Fakultät für Physik, Universität Bielefeld, 33615 Bielefeld
We explore the temporal relaxation of quantum many-body systems under the influence of weak-to-moderate perturbations. Situations we have in mind include, for instance, a sudden quench from one Hamiltonian to a related but different second Hamiltonian. Another example are integrable systems subject to a small integrability-breaking perturbation, commonly leading to prethermalization. Using a typicality approach, we show that the perturbed dynamics resembles the unperturbed time evolution modulated by an exponential decay towards the (possibly modified) long-time limit. We support our theory by comparison with both experimental and numerical data.