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

Many Feshbach resonances are observed in an ultracold mixture of $^{85}$Rb-$^{87}$Rb atoms, including three previously unknown resonances in the lowest ground state channel of $^{85}$Rb$|2, 2\rangle \otimes ^{87}$Rb$|1, 1\rangle$ and three new ones in the higher ground channel $|2, -2\rangle \otimes |1, -1\rangle$ [1]. Of particular interests, we discover a wide and open-channel-dominated p-wave resonance, implicating exciting opportunities for studying a variety of p-wave interaction dominated physics of superfluid boson mixtures, such as three-body recombination decay and formation of p-wave heteronuclear molecules. This study is made possible by the predictive power of the semi-analytic multi-channel quantum defect theory (MQDT) [2]. \\\\ 1. S. B. Papp and C. E. Wieman,Phys. Rev. Lett. \textbf{97}, 180404 (2006).\\ 2. Bo Gao, Phys. Rev. A \textbf{84}, 022706 (2011).