Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields

Abstract

We explore the scattering properties of ultracold ground-state Cs atoms at magnetic fields between 450 G (45 mT) and 1000 G. We identify 17 new Feshbach resonances, including two very broad ones near 549 G and 787 G. We measure the binding energies of several different dimer states by magnetic field modulation spectroscopy. We use least-squares fitting to these experimental results, together with previous measurements at lower field, to determine a new 6-parameter model of the long-range interaction potential, designated M2012. Coupled-channels calculations using M2012 provide an accurate mapping between the s-wave scattering length and the magnetic field over the entire range of fields considered. This mapping is crucial for experiments that rely on precise tuning of the scattering length, such as those on Efimov physics.

19 pages, 18 figures

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Cited by in corpus (11)

• Observation of Efimov Resonances in a Mixture with Extreme Mass Imbalance
• Universal van der Waals Physics for Three Ultracold Atoms
• Contrasting the wide Feshbach resonances in ${}^6$Li and ${}^7$Li
• Resonant atom-dimer collisions in cesium: Testing universality at positive scattering lengths
• Universality of weakly bound dimers and Efimov trimers close to Li-Cs Feshbach resonances
• Quantum defect model of a reactive collision at finite temperature
• The three-body parameter for Efimov states in lithium-6
• Feshbach resonances, molecular bound states and prospects of ultracold molecule formation in mixtures of ultracold K and Cs
• Finite-temperature effects on a triatomic Efimov resonance in ultracold cesium
• Efimov states in Li-Cs mixtures within a minimal model
• Repeated output coupling of ultracold Feshbach molecules from a Cs BEC