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Q: Fachverband Quantenoptik und Photonik

Q 60: Quantengase (Gemische / Tunneleffekte)

Q 60.3: Vortrag

Freitag, 14. März 2008, 11:30–11:45, 3G/H

Heteronuclear Feshbach resonances in a mixture of ultracold ⁸⁷Rb and ¹³³Cs atoms — •Andrea Prantner¹, Almar Lange¹, Karl Pilch¹, Gabriel Kerner², Francesca Ferlaino¹, Hanns-Christoph Nägerl¹, and Rudolf Grimm^{1, 2} — ¹Institut für Experimentalphysik, Innsbruck, Austria — ²Institut für Quantenoptik und Quanteninformation,

In the last few years there has been a growing interest in the in the area of heteronuclear ultracold quantum gases and the production of heteronuclear molecules via Feshbach resonances. We present the first observation of heteronuclear Feshbach resonances in a mixture of ultracold ⁸⁷Rb and ¹³³Cs. We give an overview about our experimental setup and the procedure of sample preparation. One of the key ingredients to reach the ultracold limit is the implementation of simultaneous degenerate Raman sideband cooling on both species. This cooling technique allows us to get around 10⁸ atoms, fully polarized in the lowest magnetic sublevel at a temperature of ∼1µ K in a crossed dipole trap. We discuss the next steps towards double degeneracy and present our approach to produce ground state RbCs molecules starting from weakly bound Feshbach molecules.