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Observation of hysteresis in a superfluid Bose-Einstein condensate with a weak link

Stephen Eckel, J.G. Lee, Kevin Wright +3 more

Bulletin of the American Physical SocietyMar 19, 20130 citations

Superfluidity and Bose–Einstein Condensation in a Dipolar Bose Gas with Weak Disorder

Abdelâali Boudjemâa

arXiv:1505.05791Journal of Low Temperature PhysicsJun 10, 201525 citations

Dynamical excitations in a toroidal Bose-Einstein condensate

Kevin Wright, Anand K. Ramanathan, R. B. Blakestad +2 more

Bulletin of the American Physical SocietyJun 15, 20110 citations

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

Kevin Wright, R. B. Blakestad, Christopher J. Lobb +2 more

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.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.

arXiv:1208.3608Physical Review LettersJan 10, 2013349 citations

Superflow in a Toroidal Bose-Einstein Condensate: An Atom Circuit with a Tunable Weak Link

Anand K. Ramanathan, Kevin Wright, Sérgio Ricardo Muniz +6 more

We have created a long-lived (≈40 s) persistent current in a toroidal Bose-Einstein condensate held in an all-optical trap. A repulsive optical barrier across one side of the torus creates a tunable weak link in the condensate circuit, which can affect the current around the loop. Superflow stops abruptly at a barrier strength such that the local flow velocity at the barrier exceeds a critical velocity. The measured critical velocity is consistent with dissipation due to the creation of vortex-antivortex pairs. This system is the first realization of an elementary closed-loop atom circuit.We have created a long-lived (≈40 s) persistent current in a toroidal Bose-Einstein condensate held in an all-optical trap. A repulsive optical barrier across one side of the torus creates a tunable weak link in the condensate circuit, which can affect the current around the loop. Superflow stops abruptly at a barrier strength such that the local flow velocity at the barrier exceeds a critical velocity. The measured critical velocity is consistent with dissipation due to the creation of vortex-antivortex pairs. This system is the first realization of an elementary closed-loop atom circuit.

arXiv:1101.0019Physical Review LettersMar 28, 2011533 citations

Study of bose einstein condensates in superfluid regime

Priyanka Verma

Jan 1, 20130 citations

Studies of a toroidal superfluid Bose-Einstein condensate with a weak link

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