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Time-averaged adiabatic ring potential for ultracold atoms

Benjamin E. SherlockClarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United KingdomM. GildemeisterClarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United KingdomE. OwenClarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United KingdomE. NugentClarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United KingdomC. J. FootClarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom

2011en

ABI

Annotatsiya

We report the experimental realization 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 $11\mathrm{s}$ and the ring radius was continuously varied from $50 \ensuremath{\mu}\text{m}$ to $262 \ensuremath{\mu}\text{m}$. An efficient method of loading the ring from a conventional time-averaged orbiting potential 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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Identifikatorlar

DOI: 10.1103/physreva.83.043408

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