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arXiv:1202.1199 · Physical Review A

Feshbach spectroscopy and scattering properties of ultracold Li + Na mixtures

T. Schuster, R. Scelle, A. Trautmann, Steven Knoop, Markus K Oberthaler, M. M. Haverhals, M. R. Goosen, S. J. J. M. F. Kokkelmans, E. Tiemann

Published Apr 27, 2012• 51 citations

Abstract

We have observed 26 interspecies Feshbach resonances at fields up to 2050 G in ultracold ${}^{6}\text{Li}+{}^{23}\text{Na}$ mixtures for different spin-state combinations. Applying the asymptotic bound-state model to assign the resonances, we found that most resonances have $d$-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 ${}^{7}\text{Li}+{}^{23}\text{Na}$ and predict broad Feshbach resonances suitable for tuning.

DOI: 10.1103/physreva.85.042721

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We have observed 26 interspecies Feshbach resonances at fields up to 2050 G in ultracold

{}^{6}\text{Li}+{}^{23}\text{Na}

mixtures for different spin-state combinations. Applying the asymptotic bound-state model to assign the resonances, we found that most resonances have

d

-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

{}^{7}\text{Li}+{}^{23}\text{Na}

and predict broad Feshbach resonances suitable for tuning.

We perform Feshbach spectroscopy in an ultracold mixture of

^{23}\mathrm{Na}

and

^{40}\mathrm{K}

with different spin-state combinations. We observed 24 new interspecies Feshbach resonances at magnetic fields up to 350 G. A full coupled-channel calculation is performed to assign these resonances. Among them, 12 resonances are identified as

d

-wave Feshbach resonances. These

d

-wave Feshbach resonances are about 5 G systematically smaller than the predictions based on the previous model potential. Taking into account these experimental results, we improve the Born-Oppenheimer potentials between Na and K and achieve good agreement between the theory and experiment for all the observed Feshbach resonances.

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.

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

s

-wave channels and the rest to

p

-wave channels. We use the

s

-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.

We have studied magnetic Feshbach resonances in an ultracold sample of Na prepared in the absolute hyperfine ground state. We report on the observation of three

s

-, eight

d

-, and three

g

-wave Feshbach resonances, including a more precise determination of two known

s

-wave resonances, and one

s

-wave resonance at a magnetic field exceeding 200 mT. Using a coupled-channels calculation we have improved the sodium ground-state potentials by taking into account these new experimental data and derived values for the scattering lengths. In addition, a description of the molecular states leading to the Feshbach resonances in terms of the asymptotic-bound-state model is presented.

We observe interspecies Feshbach resonances due to

s

-wave bound states in ultracold $^{39}\mathrm{K}\ensuremath{-}^{133}\mathrm{Cs}$ scattering for three different spin mixtures. The resonances are observed as joint atom loss and heating of the K sample. We perform least-squares fits to obtain improved K-Cs interaction potentials that reproduce the observed resonances, and carry out coupled-channel calculations to characterize the scattering and bound-state properties for

^{39}\mathrm{K}

-Cs,

^{40}\mathrm{K}

-Cs, and

^{41}\mathrm{K}

-Cs. Our results open up the possibilities of tuning interactions in K-Cs atomic mixtures and of producing ultracold KCs molecules.