Hannover 2016 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Ultra-cold atoms, ions and BEC I (with A)
Q 31.5: Talk
Wednesday, March 2, 2016, 12:00–12:15, f107
Towards the production of RbCs ground-state molecules from degenerate gases in an optical lattice — •Andreas Schindewolf1, Lukas Reichsöllner2, Silva Mezinska1, Beatrix Mayr1, Rudolf Grimm1,2, and Hanns-Christoph Nägerl1 — 1Institut für Experimentalphysik, Universität Innsbruck — 2Institut für Quantenoptik und Quanteninformation IQOQI, Innsbruck
Ultracold dipolar systems are of high interest for quantum chemistry, precision spectroscopy, quantum many-body physics, and quantum simulation. Our goal is the production of a low entropy sample of dipolar RbCs molecules in the rovibronic and hyperfine ground-state. To be able to mix degenerate samples of Rb and Cs, the inter-species scattering length aRbCs has to be tuned close to zero by means of a magnetic Feshbach resonance. Since Cs three-body losses would cause a breakdown of a Cs BEC in the magnetic-field region, in which RbCs Feshbach resonances are available, we initially prepare a Cs Mott insulator with unity filling spatially separated from the Rb sample. The optical lattice wavelength and depth are chosen in a way that Rb is still superfluid and can be overlapped with Cs after switching the magnetic field to achieve aRbCs = 0. Precise control over the relative position of the two degenerate samples and high magnetic field stability will enable the formation of RbCs Feshbach molecules with a high filling factor of the optical lattice followed by the application of the STIRAP transfer to the absolute molecular ground-state, as demonstrated in Ref. [1].
[1] T. Takekoshi et al., Phys. Rev. Lett. 113, 205301 (2014)