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Isabella Fritsche

Austrian Academy of Science and University of Innsbruck

Tuesday, September 27th, 2016 at 11:00:00 AM

LENS - Conference room Querzoli

Published on-line at 09:42:42 AM on Monday, September 19th, 2016

From a Fermi-Fermi System to a Fermi-Bose System: Current Status of the Innsbruck Experiment

On Tuesday, September 27th, 2016 at 11.00 AM

We report on the production of a double-degenerate, 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 BEC fraction close to 1 and a T /TF ≈ 0.04 with 105 Li 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 (FR) at 335.8 G we use another scheme of evaporation around 300 G which enables us to have similar results as when evaporating at high field. Currently, we are exploring the repulsive side of the 335.8 G FR and see evidence for a phase separation between 6Li and 41K at strong repulsive interactions.

For further informations, please contact Matteo Zaccanti.