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TT: Fachverband Tiefe Temperaturen

TT 62: Nonequilibrium Quantum Many-Body Systems II (joint session TT/DY)

TT 62.2: Talk

Wednesday, March 14, 2018, 15:30–15:45, H 3010

Prethermalization without canonical transformations — Marc Alexander and •Marcus Kollar — Theoretische Physik III, Universität Augsburg

Weakly quenched quantum systems often exhibit a prethermalization regime on short to intermediate time scales, which is usually derived using canonical transformations [1,2]. We show how to skip this step and directly obtain the transient behavior, the long-time average, and the dressed constants of motion for arbitrary time-dependent protocols. We apply these results to fermionic Hubbard models for a variety of time-dependent perturbations.
[1] M. Moeckel and S. Kehrein, Phys. Rev. Lett. 100, 175702 (2008)
[2] M. Kollar et al., Phys. Rev. B 84, 054304 (2011)