Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum gases: Bosons I
Q 12.5: Vortrag
Montag, 18. März 2013, 15:15–15:30, E 001
Solitonic states far from equilibrium — •Sebastian Erne1,2, Boris Nowak1,2, and Thomas Gasenzer1,2 — 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
The dynamics of an ultracold Bose gas far from equilibrium in one spatial dimension is analysed in the context of quasi-stationary solitonic states. We analytically describe the state within a model of randomly distributed solitons and address the possibilities for new experimental observations via statistical simulations using the classical field equations. Focus is placed on the one particle momentum distribution, concerning the appearance of transient power-laws, characteristic multi-peak structures for small momenta in a finite size system, and it’s measurement in focus through the free expansion of the gas. Further, the influence of solitons on the density-density correlation after free expansion are addressed. Different scenarios including an anharmonicity of the trapping potential and the influence of temperature in the quasi-condensate regime are discussed. The results give detailed insight into the dynamics of solitons in these systems.