Dispersive optical detection of magnetic Feshbach resonances in ultracold gases

Abstract

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 ${}^{87}$Rb, between the $|\mathrm{F}=1,{\mathrm{m}}_{\mathrm{F}}=1⟩$ and $|\mathrm{F}=2,{\mathrm{m}}_{\mathrm{F}}=0⟩$ states. Despite the loss features being $\lesssim 0.1$ G wide, we require only 21 experimental runs to explore a magnetic field range >18 G, where $1\mathrm{G}=10^{-4}$ T. 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.

To appear in Physical Review A

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• Above threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider
• Quantum Scattering in an Optical Collider for Ultracold Atoms
• Low-cost Wireless Condition Monitoring for an Ultracold Atom Machine
• Dispersive detection of atomic ensembles in the presence of strong lensing
• Deterministic quantum state transfer of atoms in a random magnetic field
• Fast in situ observation of atomic Feshbach resonances by photoassociative ionization
• Precision Measurement of Spin-Dependent Dipolar Splitting in ${}^6$Li p-Wave Feshbach Resonances
• Exotic Quantum States in Spin-1 Bose-Einstein Condensate with Spin-Orbit Coupling in Concentric Annular Traps