Feshbach resonances with large background scattering length: interplay with open-channel resonances
摘要
Feshbach resonances are commonly described by a single-resonance Feshbach model, and open-channel resonances are not taken into account explicitly. However, an open-channel resonance near threshold limits the range of validity of this model. Such a situation exists when the background scattering length is much larger than the range of the interatomic potential. The open-channel resonance introduces strong threshold effects not included in the single-resonance description. We derive an easy-to-use analytical model that takes into account both the Feshbach resonance and the open-channel resonance. We apply our model to Rb, which has a large background scattering length, and show that the agreement with coupled-channels calculations is excellent. The model can be readily applied to other atomic systems with a large background scattering length, such as Li and Cs. Our approach provides full insight into the underlying physics of the interplay between open-channel (or potential) resonances and Feshbach resonances.
引用
@article{arxiv.cond-mat/0402278,
title = {Feshbach resonances with large background scattering length: interplay with open-channel resonances},
author = {B. Marcelis and E. G. M. van Kempen and B. J. Verhaar and S. J. J. M. F. Kokkelmans},
journal= {arXiv preprint arXiv:cond-mat/0402278},
year = {2009}
}
备注
16 pages, 12 figures, accepted for publication in Phys. Rev. A; v2: added references