arXiv:0711.2916 · Physical Review Letters

Exploring an Ultracold Fermi-Fermi Mixture: Interspecies Feshbach Resonances and Scattering Properties of Li6 and K40

E. Wille, F. M. Spiegelhalder, Gabriel Kerner, D. Naik, A. Trenkwalder, G. Hendl, Florian Schreck, Rudolf Grimm, T. G. Tiecke, Jook T. M. Walraven, S. J. J. M. F. Kokkelmans, Eite Tiesinga, Paul S. Julienne

Published Feb 5, 2008• 313 citations

arXiv HTML PDF

Abstract

We report on the observation of Feshbach resonances in an ultracold mixture of two fermionic species, (6)Li and (40)K. The experimental data are interpreted using a simple asymptotic bound state model and full coupled channels calculations. This unambiguously assigns the observed resonances in terms of various s- and p-wave molecular states and fully characterizes the ground-state scattering properties in any combination of spin states.

DOI: 10.1103/physrevlett.100.053201

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arXiv:0711.2916 · Physical Review Letters

Exploring an Ultracold Fermi-Fermi Mixture: Interspecies Feshbach Resonances and Scattering Properties of Li6 and K40

Published Feb 5, 2008• 313 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physrevlett.100.053201

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arXiv:1709.01260Physical Review ADec 15, 201721 citations

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 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.

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.

s

-wave molecular channels by comparison to an asymptotic bound state model and coupled-channel calculations. Additional Feshbach resonances are studied in spin mixtures of a single potassium isotope, both in

^{39}\mathrm{K}

and

^{41}\mathrm{K}

. In particular, we characterize the parameters of a selected

^{39}\mathrm{K}

Feshbach resonance by radio-frequency association of Feshbach molecules. Our results could be exploited to refine the model potentials for potassium scattering. Furthermore, these new Feshbach resonances enlarge the range of experiments possible with degenerate Bose-Bose mixtures.

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.