Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Poster: Quantum Optics and Photonics III
Q 53.11: Poster
Thursday, March 9, 2017, 17:00–19:00, P OG2
BEC of 41K in a Fermi Sea of 6Li — Rianne S. Lous1,2, Isabella Fritsche1,2, •Fabian Lehmann1,2, Michael Jag1,2, Emil Kirilov1,2, Bo Huang1, and Rudolf Grimm1,2 — 1IQOQI, Austrian Academy of Science, Innsbruck, Austria — 2Inst. for Experimental Physics, University of Innsbruck, Innsbruck, Austria
We report on the production of a double-degenerate 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. We obtain 104 41K atoms with a BEC fraction close to 1 and a T/TF≈0.05 with 105 6Li atoms in each spin state. To measure the temperature of our fermionic sample we use the 41K BEC as a tool for thermometry. As the system is in thermal equilibrium we evaluate the condensed fraction of our 41K atoms and extract the temperature of the atoms. To investigate the properties of the 6Li-41K mixture near the inter-species Feshbach resonance at 335.8 G we use another scheme of evaporation around 300 G which enables us to achieve similar temperatures. We explore both the repulsive side and attractive side of the Feshbach resonance and observe phase separation for strong repulsive interactions and collapse for attractive interactions. This work is supported by the Austrian Science Fund FWF within the SFB FoQuS.