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arXiv:1211.2139 · Physical Review A

Observation of interspecies 6 Li- 133 Cs Feshbach resonances

M. Repp, R. Pires, Juris Ulmanis, Robert K. Heck, E. D. Kuhnle, Matthias Weidemüller, E. Tiemann

Published Jan 3, 2013• 99 citations
arXivHTMLPDF

Abstract

We report on the observation of 19 interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of ${}^{133}\text{Cs}$ and ${}^{6}\text{Li}$ in the two energetically lowest spin states. We assign the resonances to $s$- and $p$-wave molecular channels by a coupled-channels calculation, resulting in an accurate determination of LiCs ground-state potentials. Fits of the resonance position based on the undressed asymptotic bound state model do not provide the same level of accuracy as the coupled-channels calculation. Several broad $s$-wave resonances provide prospects to create fermionic LiCs molecules with a large dipole moment via Feshbach association followed by stimulated Raman passage. Two of the $s$-wave resonances overlap with a zero crossing of the Cs scattering length, which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture.

DOI
10.1103/physreva.87.010701

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We report the experimental and theoretical study of two-body interactions in a 6{}^{6}6Li-133{}^{133}133Cs Fermi-Bose mixture. Using a translatable dipole trap setup, we have successfully trapped the two species in the same trap with temperatures of a few microkelvins. By monitoring atom number loss and interspecies thermalization, we identify five sss-wave interspecies Feshbach resonances in the lowest two scattering channels. We construct a coupled channels model using molecular potentials to fit and characterize these resonances. Two of the resonances are as wide as 6 mT (60 G) and thus should be suitable for creating Feshbach molecules and searching for universal few-body scaling.
We present a study of interspecies Feshbach resonances in ultracold $^{7}\mathrm{Li}{\text{\ensuremath{-}}}^{133}\mathrm{Cs}$ Bose-Bose mixtures. We locate ten interspecies resonances in three different spin-state combinations. By comparing to coupled-channel calculations, we assign six of the resonances to sss-wave channels and the rest to ppp-wave channels. We use the sss-wave resonances to refine the ground-state potentials of LiCs in the coupled-channel calculations and then obtain an accurate characterization of the scattering and bound-state properties of the mixtures. Our results will be useful for future experiments with ultracold $^{7}\mathrm{Li}{\text{\ensuremath{-}}}^{133}\mathrm{Cs}$ mixtures.
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We have observed 26 interspecies Feshbach resonances at fields up to 2050 G in ultracold 6Li+23Na{}^{6}\text{Li}+{}^{23}\text{Na}6Li+23Na mixtures for different spin-state combinations. Applying the asymptotic bound-state model to assign the resonances, we found that most resonances have ddd-wave character. This analysis serves as guidance for a coupled-channel 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 7Li+23Na{}^{7}\text{Li}+{}^{23}\text{Na}7Li+23Na and predict broad Feshbach resonances suitable for tuning.
We report the observation of interspecies Feshbach resonances in an optically trapped mixture of 85{}^{85}85Rb and 133{}^{133}133Cs. We measure nine resonances in the lowest spin channel for a magnetic field range from 0 to 700 G and show that they are in good agreement with coupled-channel calculations. The interspecies background scattering length is close to zero over a large range of magnetic fields, permitting the sensitive detection of Feshbach resonances through interspecies thermalization. Our results confirm the quality of the Rb-Cs potential curves [Phys. Rev. A 85, 032506 (2012)] and offer promising starting points for the production of ultracold polar molecules.