Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster II

Q 55.7: Poster

Donnerstag, 11. März 2010, 16:00–19:00, Lichthof

Feshbach resonances in mixtures of ⁶Li and ⁴⁰K — •Antje Ludewig¹, Tobias Tiecke¹, Steve Gensemer^1,2, Sebastian Kraft^1,3, and Jook Walraven¹ — ¹Van der Waals-Zeeman Institute of the University of Amsterdam, The Netherlands — ²Ethel Walker School, Simsbury, United States — ³PTB, Braunschweig

We report on the measurement of Feshbach resonances in Fermi-Fermi mixtures. For this purpose we have created 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 -atoms at T  0.3T_F. To create the mixture we start by loading a two-species magneto-optical trap (MOT) from two separate 2D-MOT sources. We realized for the first time a 2D-MOT source for lithium, yielding a large cold flux of up to 10⁹ s⁻¹. The mixture is then captured in an optically-plugged magnetic quadrupole trap. After sympathetic cooling of ⁶Li by ⁴⁰K to T∼10µK the mixture is loaded into optical tweezers. The mixture is optically transported over a distance of 21.5 cm into a science cell where we measure Feshbach resonances using magnetic field coils designed for high homogeneity. We report on our progress measuring the width of Feshbach resonances in ⁶Li -⁴⁰K mixtures and locating resonances in mixtures of ⁴⁰K.