Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantengase (Gemische / Tunneleffekte)

Q 60.4: Talk

Friday, March 14, 2008, 11:45–12:00, 3G/H

Feshbach Resonances in a Lithium Rubidium Mixture — •Carsten Marzok, Benjamin Deh, Philippe W. Courteille, and Claus Zimmermann — Physikalisches Institut, Universität Tübingen, Auf der Morgenstelle 14, D-72076

Ultracold atomic gases are a versatile instrument allowing to study the rich field of many body physics with unprecedented control. Indeed the coupled dynamics is governed by few parameters only, namely temperature, masses of the constituents and the interactions between them. In ultracold gases these interactions are ruled by the s-wave scattering length. Control over this parameter is provided by magnetic Feshbach resonances. The physics involved can be enriched by choosing a mixture of different atomic species with different masses and different quantum statistics i.e. Bose-Fermi mixtures. The lithium-rubidium system is remarkable among these because of its large mass difference. In recent experiments we were able to detect two heteronuclear Feshbach resonances in the ⁶Li-⁸⁷Rb system, that now make it possible to study the physics of this rich system in more detail. The characterization of these resonances and further experiments will be discussed in this presentation.