Magnetic control of the interaction in ultracold K-Rb mixtures.
We predict the presence of several magnetic Feshbach resonances in selected Zeeman sublevels of the isotopic pairs 40K-87Rb and 41K-87Rb at magnetic fields up to 10(3) G. Positions and widths are determined combining a new measurement of the 40K-87Rb inelastic cross section with recent experimental results on both isotopes. The possibility of driving a K-Rb mixture from the weak to the strong interacting regime tuning the applied field should allow one to achieve the optimal conditions for boson-induced Cooper pairing in a multicomponent 40K-87Rb atomic gas and for the production of ultracold polar molecules.
INFM and Department of Chemistry, University of Perugia, I-06123 Perugia, Italy.
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