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arXiv 1208.3608cond-mat.quant-gas
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具有旋转弱环节的超流原子回路中的驱动相位滑移

Driving phase slips in a superfluid atom circuit with a rotating weak link

K. C. Wright, R. B. Blakestad, C. J. Lobb, W. D. Phillips, G. K. Campbell

摘要:

我们在环形原子(23 Na)玻色-爱因斯坦凝聚体周围观察到量子化持续电流态之间的相位滑移。这些相位滑移是由一个围绕环缓慢旋转的弱链接(一个局部区域的超流密度降低)引起的。这类似于在外部磁场存在下具有弱连接的超导回路的行为。当弱连接旋转得更快时,定义明确的相位滑移不再发生,涡旋进入冷凝物的主体。该系统的一个值得注意的特点是能够动态地改变弱连接,从而改变临界电流,这是一个很难在超导或超流氦电路中实现的特点。

英文摘要:

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 weak link and hence the critical current, a feature which is difficult to implement in superconducting or superfluid helium circuits.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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