Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantengase (Gitter II)
Q 22.6: Vortrag
Dienstag, 11. März 2008, 17:45–18:00, 1C
Controlled Loading of an Ultracold Bose-Fermi-Mixture into an Optical Lattice Potential — •Sebastian Will, Thorsten Best, Ulrich Schneider, Lucia Hackermüller, Dries van Oosten, and Immanuel Bloch — Johannes Gutenberg-Universität Mainz
The formation of heteronuclear molecules is a major goal of multi-species experiments with ultracold atoms. In this context optical lattices are expected to enhance the lifetime of weakly bound Feshbach molecules considerably by protective enclosure of single molecules on single lattice sites. However, the achievement of this configuration necessitates appropriate loading of the atomic clouds into the lattice before association.
In our setup we cool fermionic 40K with bosonic 87Rb sympathetically, reaching simultaneous quantum degeneracy with about 2·105 atoms per species. We load this mixture into a blue-detuned optical lattice and adjust the external confinement independently with additional red-detuned laser beams. This allows for the creation of an almost homogeneous lattice potential. Together with tuneable interspecies interactions our setup permits controlled loading - suitable for the creation of molecules in the lattice.