Broad Feshbach resonances in mixtures of fermionic quantum gases

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• Jook Walraven (Amsterdam)
• Tuesday 16 February 2010, 15:30-16:30
• Physics East 217.

If you have a question about this talk, please contact Vincent Boyer.

The study of Fermionic quantum gases with unequal mass has gained a lot of interest in the past years. The only experimentally realized ultracold fermionic mixture with a significant mass-imbalance is the mixture of 6Li and 40K. Studies of many-body phenomena require strong interactions between the two species, which can be realized by means of a Feshbach resonance. Universal studies on strongly interacting fermions can be performed around such a resonance if it is sufficiently broad. We explore the widths of interspecies Feshbach resonances in a mixture of 6Li and 40K. We developed a theoretical model to map the positions and widths of all the available Feshbach resonances for any system. This allows us to select the optimal resonance for studies of the 6Li/40K mixture. We present the first experimental determination of the width of a resonance in this mixture, Delta B = 1.5(5) G, being one of the broadest. Our results offer good perspectives for the study of universal crossover physics in a mass-imbalanced Fermi-Fermi mixture.

This talk is part of the Cold Atoms series.

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• Bham Talks
• Cold Atoms
• Physics East 217
• What's on in Physics?

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