Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 45: Ultra Cold Atoms, Ions and BEC III (with A)

Q 45.6: Talk

Thursday, March 11, 2010, 11:45–12:00, F 303

From single to many particle Rabi oscillations — •Tilman Zibold, Eike Nicklas, Christian Gross, Helmut Strobel, Ion Stroescu, Wolfgang Müssel, and Markus K. Oberthaler — Kirchhoff Institute for Physics, University of Heidelberg, Germany

We experimentally investigate the Josephson dynamics between two weakly coupled spin states in a Bose-Einstein condensate of Rubidium. The relevant parameters of this system are the interaction energy and the tunneling rate. Our system allows for the tuning of the interaction energy by an inter species Feshbach resonance whereas the tunneling rate is controlled by the two photon coupling between the modes. The Josephson dynamics can be divided in three different regimes characterized by the emergence of different dynamics. The adjustability of the system allows us to enter all these three regimes. By measuring atom number imbalance and the corresponding phase we are able to map out phase plane trajectories of all predicted dynamics. The occurrence of self trapped states is further investigated to identify the corresponding bifurcation in the phase plane portrait. The analysis of the small amplitude oscillations with mean phase 0 and pi respectively allows us a precise determination of the interaction energy between the two modes and therefore a characterization of the elastic part of the Feshbach resonance.