Observation of broad p-wave Feshbach resonances in ultracold $^{85}$Rb-$^{87}$Rb mixtures

TL;DR

This paper reports the discovery of broad p-wave Feshbach resonances in ultracold $^{85}$Rb-$^{87}$Rb mixtures, enabling new research avenues in p-wave interaction physics.

Contribution

The study identifies and characterizes broad p-wave Feshbach resonances in ultracold Rb mixtures using multichannel quantum-defect theory, expanding understanding of p-wave interactions.

Findings

Identification of broad p-wave resonances

Resonance positions predicted and characterized

Implications for p-wave physics studies

Abstract

We observe new Feshbach resonances in ultracold mixtures of $^{85}$Rb and $^{87}$Rb atoms in the $^{85}$Rb$|2, +2\rangle$+$^{87}$Rb$|1, +1\rangle$ and $^{85}$Rb$|2, -2\rangle$+$^{87}$Rb$|1, -1\rangle$ scattering channels. The positions and properties of the resonances are predicted and characterized using the semi-analytic multichannel quantum-defect theory by Gao. Of particular interest, a number of broad entrance-channel dominated p-wave resonances are identified, implicating exciting opportunities for studying a variety of p-wave interaction dominated physics.