A dilute mixture of atoms and molecules
  We study a dilute gas with two species of Fermionic atoms of unequal concentrations, interacting via a short-range interaction with one deeply bound state. We study the properties of this system under the mean-field approximation. We obtain the effective interaction among the fermions and bosons, and discuss the collective modes of the system. 
S.-K. Yip (Academia Sinica, Taiwan)