Rb-85 tunable-interaction Bose-Einstein condensate machine

Abstract

We describe our experimental setup for creating stable Bose-Einstein condensates of Rb-85 with tunable interparticle interactions. We use sympathetic cooling with Rb-87 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 Rb-85 atoms. Typical Rb-85 condensates contain 4 x 10^4 atoms with a scattering length of a=+200a_0. Our minimalist apparatus is well-suited to experiments on dual-species and spinor Rb condensates, and has several simplifications over the Rb-85 BEC machine at JILA (Papp, 2007; Papp and Wieman, 2006), which we discuss at the end of this article.

10 pages, 8 figures

References in corpus (15)

• Anderson localization of a non-interacting Bose-Einstein condensate
• Observation of resonance condensation of fermionic atom pairs
• Direct observation of Anderson localization of matter-waves in a controlled disorder
• Production of cold molecules via magnetically tunable Feshbach resonances
• Stable 85Rb Bose-Einstein Condensates with Widely Tunable Interactions
• Strong dipolar effects in a quantum ferrofluid
• Extreme tunability of interactions in a ${}^7$Li Bose-Einstein condensate
• Control of Interaction-Induced Dephasing of Bloch Oscillations
• 39-K Bose-Einstein condensate with tunable interactions
• Atom interferometry with a weakly-interacting Bose Einstein condensate
• Magnetic Field Dependence of Ultracold Inelastic Collisions near a Feshbach Resonance
• Observation of Feshbach resonances in an ultracold gas of ${}^{52}$Cr
• Observation of Heteronuclear Feshbach Molecules from a ${}^{85}$Rb - ${}^{87}$Rb gas
• Very high precision bound state spectroscopy near a ${}^{85}$Rb Feshbach resonance
• Measurement of inelastic losses in a sample of ultracold Rb-85

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