Feshbach spectroscopy and scattering properties of ultracold Li+Na mixtures

Details Feshbach spectroscopy and scattering properties of ultracold Li+Na mixtures Feshbach spectroscopy and scattering properties of ultracold Li+Na mixtures

2012-02-06

arxiv.org/abs/1202.1199v1

Physics

Condensed Matter

Quantum Gases

8 pages, 4 figures

Scientific paper

We have observed 26 interspecies Feshbach resonances at fields up to 2050 G in ultracold $^6$Li+$^{23}$Na mixtures for different spin-state combinations. Applying the asymptotic bound-state model to assign the resonances, we have found that most resonances have d-wave character. This analysis serves as guidance for a coupled-channels calculation, which uses modified interaction potentials to describe the positions of the Feshbach resonances well within the experimental uncertainty and to calculate their widths. The scattering length derived from the improved interaction potentials is experimentally confirmed and deviates from previously reported values in sign and magnitude. We give prospects for $^7$Li+$^{23}$Na and predict broad Feshbach resonances suitable for tuning.

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