Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Dynamics in many-body systems: Equilibration and localization II (joint session DY/TT)

TT 20.2: 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.