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An atomic superfluid Bose-Einstein condensate in a ring

William Phillips, Joint Quantum Institute/National Institute of Standards and Technology

(Session 6 : Friday from 8:30am - 9:15am)

A Bose-Einstein condensate extending around a ring-shaped trap that is interrupted by a repulsive barrier can exhibit behavior similar to that of a superconducting loop interrupted by a weak link or Josephson junction. [ See, for example, K. Wright, R. Blakestad, C. Lobb, W. Phillips, and G. Campbell, Phys. Rev. Lett 110, 025302 (2013). DOI: 10.1103/PhysRevLett.110.025302]. We observe controllable, discrete phase slips (jumps in the phase winding number around the ring) and hysteretic behavior. Analogies to the superconducting circuit can describe much of the behavior of this atomtronic circuit. This work was partially supported by the ONR, the NSF, and the ARO.