M. Repp, R. Pires, J. Ulmanis, R. Heck, E. D. Kuhnle, M. Weidemüller, E. Tiemann
We report on the observation of nineteen interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of ^{133}Cs and ^6Li in their 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 ^6Li^{133}Cs ground state potentials. In contrast, application of the Asymptotic Bound State model fails to accurately reproduce the magnetic fields of the resonances. Several broad s-wave resonances provide the opportunity 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 ^{133}Cs scattering length which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture.
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http://arxiv.org/abs/1211.2139
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