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Q: Quantenoptik und Photonik

Q 34: Poster Quantengase

Q 34.16: Poster

Dienstag, 14. März 2006, 16:30–18:30, Labsaal

Non-equilibrium dynamics of a Bose gas in a double-well trap — •Kristan Temme and Thomas Gasenzer — Institut für Theoretische Physik, Philosophenweg 16, 69120 Heidelberg

The time evolution of a Bose-Einstein condensate trapped in a double-well potential is studied away from thermal equilibrium, using a full quantum many-body treatment on the basis of Green-functions techniques in field theory. Two-well trapping potentials have gained much importance in studying the matter-wave analogue of the Josephson effect in solid state physics. Due to the physical scales governing the tunneling-coupled matter wave packets, details of the dynamical evolution become amenable to experimental studies. The far-from-equilibrium configurations of particular interest are those where quantum fluctuations become important which are not taken into account in mean-field theory. An approach to beyond-mean-field quantum many-body theory is presented which allows to describe both the short and long-time evolution of a gas away from equilibrium. The dynamical many-body theory remains applicable at long times, where thermal equilibrium is approached. The method allows to distinguish quantum and classical statistical aspects of the dynamical evolution.