Quantum-degenerate mixture of fermionic lithium and bosonic rubidium gases

Abstract

We report on the observation of sympathetic cooling of a cloud of fermionic 6-Li atoms which are thermally coupled to evaporatively cooled bosonic 87-Rb. Using this technique we obtain a mixture of quantum-degenerate gases, where the Rb cloud is colder than the critical temperature for Bose-Einstein condensation and the Li cloud colder than the Fermi temperature. From measurements of the thermalization velocity we estimate the interspecies s-wave triplet scattering length |a_s|=20_{-6}^{+9} a_B. We found that the presence of residual rubidium atoms in the |2,1> and the |1,-1> Zeeman substates gives rise to important losses due to inelastic collisions.

4 pages, 3 figures

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• Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
• Observation of Bose-Einstein Condensation of Molecules
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Weakly bound dimers of fermionic atoms
• Optical Production of Ultracold Polar Molecules
• Calculation of accurate permanent dipole moments of the lowest ${}^{1,3}{\Sigma }^{+}$ states of heteronuclear alkali dimers using extended basis sets
• Observation of Heteronuclear Feshbach Resonances in a Bose-Fermi Mixture
• Observation of Feshbach resonances between two different atomic species
• Formation of Quantum-Degenerate Sodium Molecules
• Production and state-selective detection of ultracold, ground state RbCs molecules
• Ultracold collisions involving heteronuclear alkali metal dimers
• Scattering parameters for cold-Li-Rb and Na-Rb collisions derived from variable phase theory
• Expansion of a lithium gas in the BEC-BCS crossover

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