We report on the achievement of simultaneous quantum degeneracy in a mixed gas of fermionic K-40 and bosonic Rb-87. 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.
Fermi-Bose quantum degenerate 40K-87Rb mixture with attractive interaction / G. ROATI; F. RIBOLI; G. MODUGNO; M. INGUSCIO. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 89:(2002), pp. 0-0. [10.1103/PhysRevLett.89.150403]
Fermi-Bose quantum degenerate 40K-87Rb mixture with attractive interaction
F. RIBOLI;MODUGNO, GIOVANNI
;INGUSCIO, MASSIMO
2002
Abstract
We report on the achievement of simultaneous quantum degeneracy in a mixed gas of fermionic K-40 and bosonic Rb-87. 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.
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