Feshbach resonances in ultracold Rb-85-Rb-87 and Li-6-Rb-87 mixtures

摘要

We present an analysis of experimentally accessible magnetic Feshbach resonances in ultracold heteronuclear Rb-85-Rb-87 and Li-6-Rb-87 mixtures. Using recent experimental measurements of the triplet scattering lengths for Li-6-Rb-87 and Li-7-Rb-87 mixtures and Feshbach resonances for one combination of atomic states, we create model potential curves and fine-tune them to reproduce the measured resonances and to predict the location of several experimentally relevant resonances in Li-Rb collisions. To model Rb-85-Rb-87 collisions, we use accurate Rb-2 potentials obtained previously from the analysis of experiments on Rb-87-Rb-87 collisions. We find resonances that occur at very low magnetic fields, below 10 G, which may be useful for entanglement generation in optical lattices or atom chip magnetic traps.