title: Atom-dimer scattering and long-lived trimers in fermionic mixtures.
abstract: We consider a heteronuclear fermionic mixture on the molecular side of an interspecies Feshbach resonance and discuss atom-dimer scattering properties in uniform space and in the presence of an external confining potential, restricting the system to a quasi-two-dimensional geometry. We find that there is a peculiar atom-dimer p-wave resonance which can be tuned by changing the frequency of the confinement. Our results have implications for the ongoing experiments on lithium-potassium mixtures, where this mechanism allows for switching the p-wave interaction between a K atom and Li-K dimer from attractive to repulsive, and forming a weakly bound trimer with unit angular momentum. We show that such trimers are long lived and the atom-dimer resonance does not enhance inelastic relaxation in the mixture, making it an outstanding candidate for studies of p-wave resonance effects in a many-body system.
authors.affiliation: Laboratoire Physique Théorique et Modèles Statistique, Université Paris Sud, CNRS, 91405 Orsay, France.
authors.forename: J
authors.initials: J
authors.lastname: Levinsen
authors.forename: T G
authors.initials: TG
authors.lastname: Tiecke
authors.forename: J T M
authors.initials: JT
authors.lastname: Walraven
authors.forename: D S
authors.initials: DS
authors.lastname: Petrov