%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