Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.15: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Solitonic states far from equilibrium — •Sebastian Erne1,2,3, Robert Bücker3, Boris Nowak1,2, Thomas Gasenzer1,2, and Jörg Schmiedmayer31Institut 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

We study the dynamics of solitonic excitations in a finite size ultra-cold Bose gas out of equilibrium in one spatial dimension and propose an interpretation of this state in terms of turbulence. Nontrivial finite size effects are found in the momentum distribution, in the form of characteristic multi-peak structures. We analytically describe the state within a model of randomly distributed solitons and address the possibilities for an experimental observation of the solitonic state via statistical simulations using the classical field equations. Further the creation and dynamics of solitonic defects are addressed in a variety of setups, including rapid cooling, dissipative effects and quenching the chemical potential of the system. The results give detailed insight into the effects of solitonic excitations for experiments of a rapid cooling quench performed by R. Bücker et al. at the Atominstitut in Vienna.

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