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Conference on Lasers and Electro-Optics

Bose-einstein condensation of Li/sub 2/ molecules

Cheng Chin, Selim Jochim, M. Bartenstein, A. Altmeyer, G. Hendl, S. Reidl, Johannes Hecker Denschlag, Rudolf Grimm

Published May 21, 2004• 2 citations
OpenAlex

Abstract

We achieve Bose-Einstein condensation of lithium molecules. The molecules are formed by pairing fermionic lithium atoms and they are evaporatively cooled to BEC in an optical dipole trap

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We have observed Bose-Einstein condensation of molecules. When a spin mixture of fermionic 6Li atoms was evaporatively cooled in an optical dipole trap near a Feshbach resonance, the atomic gas was converted into 6Li2 molecules. Below 600 nK, a Bose-Einstein condensate of up to 900 000 molecules was identified by the sudden onset of a bimodal density distribution. This condensate realizes the limit of tightly bound fermion pairs in the crossover between BCS superfluidity and Bose-Einstein condensation.
Summary form only given. Recently, we have created a Bose condensate of /sup 87/Rb atoms directly in an optical trap formed by tightly focused laser beams. Following initial loading from a laser cooled gas, evaporative cooling through the BEC transition is achieved by simply lowering the depth of the optical trap. Our success is due in part to a high initial phase space density realized in the loading of our optical dipole trap and in part to the tight confinement of the atoms that permits rapid evaporative cooling to the BEC transition in 2 s.