title: Broad Feshbach resonance in the 6Li-40K mixture.
abstract: 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 {6}Li/{40}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/{40}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, DeltaB=1.5(5) G. Our results offer good perspectives for the observation of universal crossover physics using this mass-imbalanced fermionic mixture.
authors.affiliation: van der Waals-Zeeman Institute of the University of Amsterdam, Valckenierstraat 65, 1018 XE, The Netherlands.
authors.forename: T G
authors.initials: TG
authors.lastname: Tiecke
authors.forename: M R
authors.initials: MR
authors.lastname: Goosen
authors.forename: A
authors.initials: A
authors.lastname: Ludewig
authors.forename: S D
authors.initials: SD
authors.lastname: Gensemer
authors.forename: S
authors.initials: S
authors.lastname: Kraft
authors.forename: S J J M F
authors.initials: SJ
authors.lastname: Kokkelmans
authors.forename: J T M
authors.initials: JT
authors.lastname: Walraven