Darmstadt 2008 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantengase (Gemische / Tunneleffekte)
Q 60.1: Talk
Friday, March 14, 2008, 11:00–11:15, 3G/H
Interacting Rubidium and Caesium Atoms — •Claudia Weber, Michael Haas, Shincy John, Nicolas Spethmann, Lars Steffens, Artur Widera, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn
In our experimental set up we magnetically trap a mixture of Rubidium and a few Caesium atoms simultaneously. We selectively cool only Rubidium atoms by a microwave field tuned to the Rubidium ground state hyperfine transition. Caesium is sympathetically cooled via elastic collisions with Rubidium. We are able to cool down the mixture to temperatures below 1µK. Analysing the dynamics of sympathetic cooling we have estimated a lower limit for the Rubidium-Caesium s-wave scattering length to 150 a0. Our next step is to load the mixture in an optical dipole trap. Using an external homogeneous magnetic field we intend to tune the inter-species interaction. We will present our latest results.