The ability to tune two-body interactions to control the macroscopic behavior of a Bose-Einstein condensate or degenerate Fermi gas is increasingly being exploited in modern experiments with dilute gases. I will discuss some of the key properties of magnetic atom-atom Feshbach resonances that are vital to incorporate into many-body descriptions. The role of these resonances in recent experiments will be addressed, including studies of the BEC-BCS crossover regime and coherent atom-molecule condensate oscillations.

Contact: Luis A. Orozco.