Feshbach resonances in mixtures of ultracold ${}^6$Li and ${}^{87}$Rb gases

Abstract

We report on the observation of two Feshbach resonances in collisions between ultracold ${}^6$Li and ${}^{87}$Rb atoms in their respective hyperfine ground states $|F,m_F>=|1/2,1/2>$ and $|1,1>$. The resonances show up as trap losses for the ${}^6$Li cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at 1066.92 G opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow p-wave Feshbach resonance in collisions of ${}^6$Li atoms at 158.55 G in the presence of a dense ${}^{87}$Rb cloud. The effect of the ${}^{87}$Rb cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

4 pages, 3 figures

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