Abstract
We study the widths of interspecies Feshbach resonances in a mixture of the fermionic quantum gases and . 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 mixture. Experimentally, we obtain the asymmetric Fano line shape of the interspecies elastic cross section by measuring the distillation rate of atoms from a potassium-rich mixture as a function of magnetic field. This provides us with the first experimental determination of the width of a resonance in this mixture, . Our results offer good perspectives for the observation of universal crossover physics using this mass-imbalanced fermionic mixture.
- Received 18 August 2009
DOI:https://doi.org/10.1103/PhysRevLett.104.053202
©2010 American Physical Society