Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Ultra-cold atoms, ions and BEC II (with Q)
A 26.2: Vortrag
Mittwoch, 2. März 2016, 14:45–15:00, f303
Fermi-Bose mixture of 6Li and 41K — Rianne S. Lous1,2, •Isabella Fritsche1,2, Bo Huang1, Michael Jag1,2, Marko Cetina1,2, Jook T.M. Walraven1,3, and Rudolf Grimm1,2 — 1Inst. for Quantum Optics and Quantum Information (IQOQI), Austrian Academy of Science, Austria — 2Inst. for Experimental Physics, University of Innsbruck, Austria — 3Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Amsterdam, Netherlands
We report on the production of a double-degenerate, strongly mass-imbalanced Fermi-Bose mixture of 6Li and 41K. In our experimental sequence the potassium atoms are sympathetically cooled by the lithium atoms, which are evaporatively cooled in an optical dipole trap at a magnetic field of 1190 G. We obtain 104 41K atoms with a 33 % BEC fraction and a T/TF≈0.1 with 105 Li atoms in each spin state. We are currently implementing a species-selective optical dimple potential to increase the BEC fraction. This paves the way to observing the collective behavior of two coupled superfluids with strong mass imbalance. We also scan the magnetic field in a region from 0 G to 1200 G and we observe multiple interspecies Feshbach resonances, which can be exploited for interaction control in strongly interacting Fermi-Bose mixtures.