Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 49: Quantengase V

Q 49.10: Talk

Wednesday, March 15, 2006, 17:45–18:00, HVI

Quantum degenerate mixture of fermionic Lithium and bosonic Rubidium gases — •B. Deh, C. Marzok, C. Silber, S. Günther, C. Zimmermann, and Ph. W. Courteille — Physikalisches Institut der Universität Tübingen

Quantum degenenerate mixtures have become a starting point towards new experiments in the field of ultracold atoms, such as the observation of the BEC-BCS crossover and the production of heteronuclear molecules. The key to such mixtures is sympathetic cooling of Fermions by a bosonic agent. We report on the cooling of ⁶Li by thermally coupling it to an evaporatively cooled gas of ⁸⁷Rb. From measurements of the thermalization time, we were able to estimate the interspecies s-wave triplet scattering length. The cooling scheme led to a mixture of both species, where the Rubidium cloud is colder than the critical temperature for Bose-Einstein condensation, and the Lithium is colder than the Fermi temperature. Our next project will be the search for interspecies Feshbach resonances