Broad Feshbach resonance in the 6Li-40K mixture

Understand

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.