Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum gases: Bosons I
Q 20.3: Talk
Tuesday, March 18, 2014, 11:15–11:30, UDL HS2002
Prethermalization in split one-dimensional Bose condensates — Tim Langen3, •Sebastian Erne1,2,3, Remi Geiger3, Bernhard Rauer3, Maximilian Kuhnert3, Thomas Schweigler3, Igor Mazets3, Thomas Gasenzer1,2, and Jörg Schmiedmayer3 — 1Institut für Theoretische Physik, Ruprecht-Karls-Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany — 3Vienna Center for Quantum Science and Technology (VCQ), Atominstitut, TU Wien, Vienna, Austria
The relaxation of nearly integrable systems is an interesting and open question. Nearly integrable systems are found to be trapped in a prethermalized state before relaxing to thermal equilibrium at a later stage. Under certain conditions these prethermalization plateaus are correctly predicted by a generalized Gibbs ensemble (GGE), however this presents the question of how many conserved quantities are necessary to accurately describe the state. We consider a coherently split one-dimensional Bose condensate, investigated via statistical simulations using the classical field equations. The time evolution is compared to experiments by T. Langen et al. at the Atominstitut in Vienna and the analytical predictions of the integrable Tomonaga-Luttinger liquid model and shows relaxation to a quasi-stationary state described by a GGE independent of the initial temperature prior to the splitting, connecting it to the non-thermal, steady state of the integrable system.