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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.
Highlights
The advancement of cold atom technology, and the level of control that can be achieved in such systems, has motivated the question if it can be used to emulate electronic circuitry, and possibly move beyond its features, Ref. [1]
Say, the equivalent of electrons moving in a semiconducting material is an interesting direction in itself, it is intriguing to capitalize on the specific features of cold atom systems, such as long-range phase coherence in Bose-Einstein condensates
We demonstrate that a regime of a controlled and effective realization of an atomtronic SQUID exists for sufficiently large potential barrier heights, for realistic temperatures
Summary
The advancement of cold atom technology, and the level of control that can be achieved in such systems, has motivated the question if it can be used to emulate electronic circuitry, and possibly move beyond its features, Ref. [1]. Say, the equivalent of electrons moving in a semiconducting material is an interesting direction in itself, it is intriguing to capitalize on the specific features of cold atom systems, such as long-range phase coherence in Bose-Einstein condensates. This motivates to realize systems inspired by superconducting circuitry. The condensate wave function is the equivalent of the superconducting wave function, and a potential barrier, at which the condensate density is suppressed, replaces the SNS interface This barrier is moved at a constant speed, which imitates a non-zero magnetic flux through the ring.
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