Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.11: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Characterization of solitonic states in a trapped ultracold Bose gas — •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
We study the dynamics of solitonic excitations in a finite size ultracold Bose gas out of equilibrium in one spatial dimension and propose an interpretation of this state in terms of turbulence. Of particular interest are non-trivial finite size effects 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. Different scenarios including an anharmonicity of the trapping potential and the measurement of the one particle momentum distribution through the free expansion of the gas are discussed. The results give detailed insight into the dynamics of solitons in these systems.