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Phys Rev Lett. 2005 Sep 30;95(14):143201. Epub 2005 Sep 29.

Bose-Einstein condensation in a circular waveguide.

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  • 1Department of Physics, University of California, Berkeley, California 94720, USA.


We have produced Bose-Einstein condensates in a ring-shaped magnetic waveguide. The few-millimeter diameter, nonzero-bias ring is formed from a time-averaged quadrupole ring. Condensates that propagate around the ring make several revolutions within the time it takes for them to expand to fill the ring. The ring shape is ideally suited for studies of vorticity in a multiply connected geometry and is promising as a rotation sensor.

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