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Bulletin of the American Physical Society

Measuring the current-phase relationship of a rotating weak link in a superfluid, quantized atomtronic circuit

Stephen Eckel, Avinash Kumar, Fred Jendrzejewski, Gretchen K. Campbell

Published Jun 5, 2014• 0 citations
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We have observed well-defined phase slips between quantized persistent current states around a toroidal atomic (23Na) Bose-Einstein condensate. These phase slips are induced by a weak link (a localized region of reduced superfluid density) rotated slowly around the ring. This is analogous to the behavior of a superconducting loop with a weak link in the presence of an external magnetic field. When the weak link is rotated more rapidly, well-defined phase slips no longer occur, and vortices enter into the bulk of the condensate. A noteworthy feature of this system is the ability to dynamically vary the current-phase relation of the weak link, a feature which is difficult to implement in superconducting or superfluid helium circuits.