Time-averaged adiabatic ring potential for ultracold atoms

Details Time-averaged adiabatic ring potential for ultracold atoms Time-averaged adiabatic ring potential for ultracold atoms

2011-02-14

arxiv.org/abs/1102.2895v3

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1103/PhysRevA.83.043408

We report the experimental realisation of a versatile ring trap for ultracold atoms. The ring geometry is created by the time-averaged adiabatic potential resulting from the application of an oscillating magnetic bias field to a rf dressed quadrupole trap. Lifetimes for a Bose-Einstein condensate in the ring exceed 11s and the ring radius was continuously varied from 50$\mu$m to 261$\mu$m. An efficient method of loading the ring from a conventional TOP trap is presented together with a rotation scheme which introduces angular momentum into the system. The ring presents an opportunity to study the superfluid properties of a condensate in a multiply connected geometry and also has applications for matter-wave interferometry.

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