Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 15: Poster I
A 15.33: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
An ultracold fermion mixture of 6Li and 40K — •Antje Ludewig, Tobias Tiecke, Sebastian Kraft, Steve Gensemer, and Jook Walraven — University of Amsterdam, The Netherlands
We report on the creation of an ultracold mixture of the fermionic alkali isotopes 6Li and 40K in an optical dipole trap. In the same trap we have realized a three-component degenerate spin mixture of 40K . To create the mixtures we start by loading a two-species magneto-optical trap (MOT) from two separate 2D-MOT sources. This is the first time a 2D-MOT source is realized for lithium. The source is clean, cold (30 m/s) and yields 3D-MOT loading rates of up to 109 6Li atoms/s. The mixtures are then captured in an optically-plugged magnetic quadrupole trap. The plug is realized with a 10 W Verdi (532nm) focused to a 14 µm waist. After forced evaporative cooling on the F=9/2-F=7/2 hyperfine transition of 40K to a temperature of 10 µK the 6Li - 40K mixture can be loaded in the optical dipole trap. The lithium temperature follows by sympathetic cooling. Thus so far we have realized degenerate spin mixtures of 10 6 40K-atoms at T = 0.3(1)TF. For the dipole trap we use a 5 W IPG fiber laser (1070 nm) focused to a 20 µm waist. By translating the dipole trap focus we have - without significant losses - transported an ultracold sample of 40K over a distance of 16 cm into a science cell. We report on our progress investigating many-body phenomena close to a Feshbach resonance using coils designed for high homogeneity.