Broad Feshbach resonance in the 6Li-40K mixture

Details Broad Feshbach resonance in the 6Li-40K mixture Broad Feshbach resonance in the 6Li-40K mixture

2009-08-14

arxiv.org/abs/0908.2071v2

Phys. Rev. Lett. 104, 053202 (2010)

Physics

Condensed Matter

Quantum Gases

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.104.053202

We study the widths of interspecies Feshbach resonances in a mixture of the fermionic quantum gases 6Li and 40K. We develop a model to calculate the width and position of all available Feshbach resonances for a system. Using the model we select the optimal resonance to study the 6Li/40K mixture. Experimentally, we obtain the asymmetric Fano lineshape of the interspecies elastic cross section by measuring the distillation rate of 6Li atoms from a potassium-rich 6Li/40K mixture as a function of magnetic field. This provides us with the first experimental determination of the width of a resonance in this mixture, Delta B=1.5(5) G. Our results offer good perspectives for the observation of universal crossover physics using this mass-imbalanced fermionic mixture.

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