期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.025302
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资金
- ONR
- ARO atomtronics MURI
- NSF PFC at JQI
- NIST-ARRA program
- Direct For Mathematical & Physical Scien
- Division Of Physics [822671] Funding Source: National Science Foundation
We have observed well-defined phase slips between quantized persistent current states around a toroidal atomic (Na-23) 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. DOI: 10.1103/PhysRevLett.110.025302
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