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Phys. Rev. Lett. 89, 150403 (2002) [4 pages]

Fermi-Bose Quantum Degenerate 40K-87Rb Mixture with Attractive Interaction

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G. Roati *, F. Riboli, G. Modugno, and M. Inguscio
European Laboratory for Nonlinear Spectroscopy and Dipartimento di Fisica, Università di Firenze, and INFM, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy

Received 1 May 2002; published 23 September 2002

We report on the achievement of simultaneous quantum degeneracy in a mixed gas of fermionic 40K and bosonic 87Rb. Potassium is cooled to 0.3 times the Fermi temperature by means of an efficient thermalization with evaporatively cooled rubidium. Direct measurement of the collisional cross-section confirms a large interspecies attraction. This interaction is shown to affect the expansion of the Bose-Einstein condensate released from the magnetic trap, where it is immersed in the Fermi sea.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.89.150403
DOI: 10.1103/PhysRevLett.89.150403
PACS: 05.30.Fk, 05.30.Jp, 32.80.Pj

* Also at: Dipartimento di Fisica, Università di Trento, 38050 Povo, Italy.

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