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.
Keywords
Cite
@article{arxiv.1212.5584,
title = {Feshbach resonances, weakly bound molecular states and coupled-channel potentials for cesium at high magnetic fields},
author = {Martin Berninger and Alessandro Zenesini and Bo Huang and Walter Harm and Hanns-Christoph Nägerl and Francesca Ferlaino and Rudolf Grimm and Paul S. Julienne and Jeremy M. Hutson},
journal= {arXiv preprint arXiv:1212.5584},
year = {2013}
}
Comments
19 pages, 18 figures