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R 85 b tunable-interaction Bose–Einstein condensate machine

2010; American Institute of Physics; Volume: 81; Issue: 6 Linguagem: Inglês

10.1063/1.3430538

1527-2400

P. A. Altin, N. P. Robins, D. Döring, J. E. Debs, R. Poldy, C. Figl, J. D. Close,

Advanced Frequency and Time Standards

We describe our experimental setup for creating stable Bose-Einstein condensates (BECs) of (85)Rb with tunable interparticle interactions. We use sympathetic cooling with (87)Rb in two stages, initially in a tight Ioffe-Pritchard magnetic trap and subsequently in a weak, large-volume, crossed optical dipole trap, using the 155 G Feshbach resonance to manipulate the elastic and inelastic scattering properties of the (85)Rb atoms. Typical (85)Rb condensates contain 4 x 10(4) atoms with a scattering length of a=+200a(0). Many aspects of the design presented here could be adapted to other dual-species BEC machines, including those involving degenerate Fermi-Bose mixtures. Our minimalist apparatus is well suited to experiments on dual-species and spinor Rb condensates, and has several simplifications over the (85)Rb BEC machine at JILA, which we discuss at the end of this article.