Driving phase slips in a superfluid atom circuit with a rotating weak link.
Driving phase slips in a superfluid atom circuit with a rotating weak link.
复制标题
具有旋转薄弱环节的超流原子回路中的驱动相滑移。
DOI：
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发表时间：
2012
影响因子：
8.6
通讯作者：
G. Campbell
中科院分区：
文献类型：
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作者：
K. Wright;R. B. Blakestad;C. Lobb;W. Phillips;G. Campbell
我们观察到环形原子 (23Na) 玻色-爱因斯坦凝聚体周围的量化持续电流状态之间存在明确的相滑移。这些相滑是由围绕环缓慢旋转的薄弱环节（超流体密度降低的局部区域）引起的。这类似于存在外部磁场时具有薄弱环节的超导环路的行为。当薄弱环节旋转得更快时，不再发生明确的相滑移，并且涡流进入大部分凝结水。该系统的一个值得注意的特点是能够动态改变薄弱环节的电流相位关系，这一特点在超导或超流氦电路中很难实现。
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.