Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 40: Poster: Ultra-cold atoms, ions and BEC
A 40.30: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.V
Interaction quenches in a one-dimensional Bose gas — •Fedja Oručević1, Anton Piccardo-Selg1, Gal Aviv1, Susanne Pielawa2, Thomas Fernholz1, and Peter Krüger1 — 1Midlands Ultracold Atom Research Centre, School of Physics and Astronomy, University of Nottingham, UK — 2The Weizmann Institute of Science, Rehovot, Israel
Atom chips allow for almost arbitrary trapping geometries for atomic ensembles and are ideally suited for the investigation of low-dimensional ultracold quantum gases at the low temperatures.
We use such an atom chip to trap and prepare a one-dimensional quasi-condensed Bose gas. Its first order correlation function (g1) decays algebraically slowly with distance, rather than exponentially like a non-degenerate thermal gas would. The exponent of this decay depends on the Luttinger parameter, i.e. the interaction strength in the system. The aim of our experiment is to address the question of what happens when the interaction strength in the gas is changed abruptly in a quench and how quickly the system adapts to the new Luttinger parameter. It is predicted that after some prethermalization time the gas will display correlations that would be expected for a more strongly interacting equilibrium gas. One can further ask whether or not or on which time scale full thermalization occurs. Answers to these questions can be obtained from determining phase correlations from interference patterns that form when one or two similar systems are released from the trap(s) after a varied time following the quench. The current progress of the experimental setup will be presented.