Berlin 2005 – wissenschaftliches Programm
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Q: Quantenoptik und Photonik
Q 2: Poster Quantengase
Q 2.13: Poster
Freitag, 4. März 2005, 11:00–12:30, Poster HU
A mixture of ultracold Rb and Yb atoms — •Nils Nemitz, Sven Kroboth, Alexander Batär, and Axel Görlitz — Heinrich-Heine-Universität Düsseldorf, Institut für Experimentalphysik
Recently, mixed-species Bose-Einstein condensates (BEC) as well as quantum degenerate Bose-Fermi mixtures have attracted significant theoretical attention and have also been experimentally realized. In our experiments, we are aiming at the creation of a two-species quantum gas with ytterbium (Yb), which in contrast to the commonly used alkali atoms has a diamagnetic ground state, and rubidium (Rb) atoms.
We have already realized a 87Rb-BEC with around 105 atoms. In addition, all seven stable Yb isotopes have been trapped in a MOT. For the fermionic isotopes 171Yb and 173Yb, MOT temperatures far below the Doppler limit could be observed.
In a second line of experiments, we investigate simultaneous magnetic trapping of 87Rb in the ground state and metastable Yb in the 3P2-state (µ=3 µB). This state is populated by radiative decay of the 1P1-state of the MOT. We were able to load ≈ 5 × 104 atoms into the magnetic trap and observed trap lifetimes of around 10 s, close to the predicted lifetime of the 3P2-state for radiative decay of ≈15 s [1].
[1] S. G. Porsev et al., Phys. Rev. A. 60, 2781 (1999)