Observation of broad p-wave Feshbach resonances in a 85Rb-87Rb mixture

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 [1]. 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 of superfluid boson mixtures, such as three-body recombination decay and formation of p-wave heteronuclear molecules. \vspace{3ex} \newline [1]Bo Gao, Phys. Rev. A 84, 022706 (2011).