Realizing and optimizing an atomtronic SQUID
arXiv:1601.05431 · doi:10.1088/1367-2630/18/5/055016
Abstract
We demonstrate how a toroidal Bose-Einstein condensate with a movable barrier can be used to realize an atomtronic SQUID. The magnitude of the barrier height, which creates the analogue of an SNS junction, is of crucial importance, as well as its ramp-up and -down protocol. For too low of a barrier, the relaxation of the system is dynamically suppressed, due to the small rate of phase slips at the barrier. For a higher barrier, the phase coherence across the barrier is suppressed due to thermal fluctuations, which are included in our Truncated Wigner approach. Furthermore, we show that the ramp-up protocol of the barrier can be improved by ramping up its height first, and its velocity after that. This protocol can be further improved by optimizing the ramp-up and ramp-down time scales, which is of direct practical relevance for on-going experimental realizations.
8 pages, 7 figures. This article is published under a CC BY license. The Version of Record is available online at http://dx.doi.org/10.1088/1367-2630/18/5/055016
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- Superflow decay in a toroidal Bose gas: The effect of quantum and thermal fluctuations
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- Dispersion Managed Elliptical Atomtronics for Interferometry
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- Josephson Dynamics in 2D Ring-shaped Condensates