%0 Journal Article %J Physical Review A %D 2017 %T Dispersive optical detection of magnetic Feshbach resonances in ultracold gases %A Bianca J. Sawyer %A Milena S. J. Horvath %A Eite Tiesinga %A Amita B. Deb %A Niels Kjærgaard %X

Magnetically tunable Feshbach resonances in ultracold atomic systems are chiefly identified and characterized through time consuming atom loss spectroscopy. We describe an off-resonant dispersive optical probing technique to rapidly locate Feshbach resonances and demonstrate the method by locating four resonances of 87Rb, between the |F=1,mF=1 and |F=2,mF=0 states. Despite the loss features being 100 mG wide, we require only 21 experimental runs to explore a magnetic field range >18 G. The resonances consist of two known s-wave features in the vicinity of 9 G and 18 G and two previously unobserved p-wave features near 5 G and 10 G. We further utilize the dispersive approach to directly characterize the two-body loss dynamics for each Feshbach resonance.

%B Physical Review A %V 96 %P 022705 %8 2017/08/18 %G eng %U https://arxiv.org/abs/1702.02216 %N 2 %R 10.1103/PhysRevA.96.022705