Three-body recombination near the d-wave resonance in ultracold 85Rb\,-87Rb mixtures
Abstract
We have studied the three-body recombination rates on both sides of the interspecies d-wave Feshbach resonance in the 85Rb\,-87Rb-87Rb system using the R-matrix propagation method in the hyperspherical coordinate frame. Two different mechanisms of recombination rate enhancement for positive and negative 85Rb\,-87Rb d-wave scattering lengths are analyzed. On the positive scattering length side, the recombination rate enhancement occurs due to the existence of three-body shape resonance, while on the negative scattering length side, the coupling between the lowest entrance channel and the highest recombination channel is crucial to the appearance of the enhancement. In addition, our study shows that the intraspecies interaction plays a significant role in determining the emergence of recombination rate enhancements. Compared to the case in which the three pairwise interactions are all in d-wave resonance, when the 87Rb-87Rb interaction is near the d-wave resonance, the values of the interspecies scattering length that produce the recombination enhancement shift. In particular, when the 87Rb-87Rb interaction is away from the d-wave resonance, the enhancement disappears on the negative interspecies scattering length side.
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