Formation of fermionic molecules via interisotope Feshbach resonances

Abstract

We perform an analysis of recent experimental measurements and improve the lithium interaction potentials. For ${}^6$Li a consistent description can be given. We discuss theoretical uncertainties for the position of the wide ${}^6$Li Feshbach resonance, and we present an analytic scattering model for this resonance, based on the inclusion of a field-dependent virtual open-channel state. We predict new Feshbach resonances for the ${}^6$Li-${}^7$Li system, and their importance for different types of crossover superfluidity models is discussed.

4 pages, 3 figures, revised version