Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 18: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 18.16: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

Optimizing the production of RbCs ground-state molecules with high phase-space density — •Lukas Reichsöllner1, Tetsu Takekoshi1,2, Andreas Schindewolf1, Silva Mezinska1, Francesca Ferlaino1,2, Rudolf Grimm1,2, and Hanns-Christoph Nägerl11Institut für Experimentalphysik, Universität Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation IQOQI, Innsbruck, Austria

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 dipolar RbCs rovibronic ground-state molecules with full control of all degrees of freedom and with high phase-space density. We first produce two spatially separated BECs of Rb and Cs. We use an optical lattice similar to the work in Ref. [1] to prevent three-body loss to create a Cs Mott insulator (MI) with single occupancy while having Rb spatially separated and superfluid (SF). We tune the interspecies interactions by using an interspecies Feshbach resonance and we move Rb on top of Cs with the aim to form a pair state with exactly one Rb and one Cs atom at each lattice site. Feshbach association and STIRAP transfer drive the Rb-Cs precursor pairs into the rovibronic ground-state. We present our work on the STIRAP ground-state transfer [2] and show data of the coexisting Rb SF and Cs MI phase in the same optical lattice as well as the Rb transport and merging of the two ultracold ensembles.

[1] J.G. Danzl et al., Nature Physics 6, 265 (2010) [2] T. Takekoshi et al., Phys. Rev. Lett. 113, 205301 (2014)

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