Broad Feshbach resonance in the ⁶Li-⁴⁰K mixture

T.G. Tiecke, M.R. Goosen, A. Ludewig, S.D. Gensemer, S. Kraft, S.J.J.M.F. Kokkelmans, J.T.M. Walraven

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We study the widths of interspecies Feshbach resonances in a mixture of the fermionic quantum gases 6Li and 4°K. 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/4°K mixture. Experimentally, we obtain the asymmetric Fano line shape of the interspecies elastic cross section by measuring the distillation rate of 6Li atoms from a potassium-rich 6Li/4°K mixture as a function of magnetic field. This provides us with the first experimental determination of the width of a resonance in this mixture, ¿B=1.5(5) G. Our results offer good perspectives for the observation of universal crossover physics using this mass-imbalanced fermionic mixture.
Original languageEnglish
Article number053202
Pages (from-to)053202-1/4
Number of pages4
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 2010


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