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Driving Phase Slips in a Superfluid Atom Circuit with a Rotating Weak Link

K. C. Wright, R. B. Blakestad, C. J. Lobb, W. D. Phillips, and G. K. Campbell
Phys. Rev. Lett. 110, 025302 – Published 10 January 2013
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Abstract

We have observed well-defined phase slips between quantized persistent current states around a toroidal atomic (Na23) 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.

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  • Received 14 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.110.025302

© 2013 American Physical Society

Synopsis

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Navigating with Cold Atoms

Published 10 January 2013

A torus of trapped cold atoms could be used as a rotation sensor.

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Authors & Affiliations

K. C. Wright*, R. B. Blakestad, C. J. Lobb, W. D. Phillips, and G. K. Campbell

  • Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA

  • *Present address: Department of Physics and Astronomy, Dartmouth College, NH 03755, USA.
  • Present address: Booz Allen Hamilton, Arlington, VA 22203, USA.
  • Also at the Center for Nanophysics and Advanced Materials, University of Maryland, College Park, MD 20742, USA.

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Vol. 110, Iss. 2 — 11 January 2013

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