Quantum-degenerate mixture of fermionic lithium and bosonic rubidium gases

Details Quantum-degenerate mixture of fermionic lithium and bosonic rubidium gases Quantum-degenerate mixture of fermionic lithium and bosonic rubidium gases

2005-06-09

arxiv.org/abs/cond-mat/0506217v2

Physics

Condensed Matter

Statistical Mechanics

4 pages, 3 figures

Scientific paper

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.

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