Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 18: Quantum gases: Mixtures, spinor gases, disorder effects
Q 18.3: Talk
Monday, March 18, 2013, 17:00–17:15, E 001
Observation of interspecies 6Li -133Cs Feshbach resonances — •Rico Pires1, Marc Repp1, Juris Ulmanis1, Robert Heck1, Eva Kuhnle1, Matthias Weidemüller1, and Eberhard Tiemann2 — 1Physikalisches Institut, Ruprecht- Karls Universität Heidelberg, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Germany
We will present the measurement of 19 interspecies Feshbach resonances in an ultracold Bose-Fermi mixture of 6Li and 133Cs in the energetically lowest spin states [1]. The resonances are assigned to s- and p-wave molecular channels by a coupled-channels calculation, which precisely reproduces all observed resonances. The undressed Asymptotic Bound State Model does not yield the same level of accuracy. 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. With two 60 G broad resonances, this system is a promising candidate for the observation of a series of Efimov resonances, due to the small Efimov scaling factor of 4.88. As two of the s-wave resonances overlap with a zero crossing of the Cs scattering length, the mixture also offers prospects for the observations of polarons.
[1] M. Repp et al., accepted for publication in Phys. Rev. A (R) (2012)