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

Berninger, Martin; Zenesini, Alessandro; Huang, Bo; Harm, Walter; Naegerl, Hanns-Christoph; Ferlaino, Francesca; Grimm, Rudolf; Julienne, Paul S.; Hutson, Jeremy M.

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Authors

Martin Berninger

Alessandro Zenesini

Bo Huang

Walter Harm

Hanns-Christoph Naegerl

Francesca Ferlaino

Rudolf Grimm

Paul S. Julienne



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 previously unreported Feshbach resonances, including two very broad ones near 549 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 six-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.

Citation

Berninger, M., Zenesini, A., Huang, B., Harm, W., Naegerl, H., Ferlaino, F., …Hutson, J. M. (2013). Feshbach resonances, weakly bound molecular states, and coupled-channel potentials for cesium at high magnetic fields. Physical Review A, 87(3), Article 032517. https://doi.org/10.1103/physreva.87.032517

Journal Article Type Article
Publication Date Jan 1, 2013
Deposit Date Jun 19, 2013
Publicly Available Date Mar 28, 2024
Journal Physical Review A
Print ISSN 1050-2947
Electronic ISSN 1094-1622
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 87
Issue 3
Article Number 032517
DOI https://doi.org/10.1103/physreva.87.032517

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Copyright Statement
© 2013 American Physical Society




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