Magnetic merging of ultracold atomic gases ofRb85andRb87

Abstract

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report the magnetic merging of ultracold atomic gases of 85 Rb and 87 Rb by the controlled overlap of two initially spatially separated magnetic traps. We present a detailed analysis of the combined magnetic-field potential as the two traps are brought together that predicts a clear optimum trajectory for the merging. We verify this prediction experimentally using 85 Rb and find that the final atom number in the merged trap is maximized with minimal heating by following the predicted optimum trajectory. Using the magnetic-merging approach allows us to create variable-ratio isotopic Rb mixtures with a single laser-cooling setup by simply storing one isotope in a magnetic trap before jumping the laser frequencies to the transitions necessary to laser cool the second isotope.

Fluctuation-driven topological transition of binary condensates in optical lattices

“…These are binary mixtures which can be driven from miscible to immiscible phase through the variation of intra-or interspecies interaction using Feshbach resonance. In particular, we consider 87 Rb -85 Rb [28,53] and 133 Cs -87 Rb [54,55] binary condensates as examples of the two cases, and study the mode evolution as the system approaches immiscible from miscible regime. To examine the mode evolution with the tuning of intraspecies interaction, we consider a quasi-1D TBEC consisting of 87 Rb and 85 Rb [28,53].…”

“…In particular, we consider 87 Rb -85 Rb [28,53] and 133 Cs -87 Rb [54,55] binary condensates as examples of the two cases, and study the mode evolution as the system approaches immiscible from miscible regime. To examine the mode evolution with the tuning of intraspecies interaction, we consider a quasi-1D TBEC consisting of 87 Rb and 85 Rb [28,53]. In this system, we consider 87 Rb and 85 Rb as the first and second species, respectively.…”

Guided transport of ultracold gases of rubidium up to a room-temperature dielectric surface

“…The atoms are then further cooled by forced RF evaporation resulting in a sample of 2.7× 10 7 atoms at a temperature of 32 µK. Further details of the apparatus are presented in [25,26].…”