A 2D ring BEC with two movable optical barriers shows a dc Josephson branch up to a measured critical current, after which vortex-antivortex pairs cause dissipation while the bulk remains phase-locked.
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Josephson Dynamics in 2D Ring-shaped Condensates
A 2D ring BEC with two movable optical barriers shows a dc Josephson branch up to a measured critical current, after which vortex-antivortex pairs cause dissipation while the bulk remains phase-locked.