arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1012.2225cond-mat.quant-gas
收藏

玻色-爱因斯坦凝聚体中的超流喷泉效应

The superfluid fountain effect in a Bose-Einstein condensate

Tomasz Karpiuk, Benoit Gremaud, Christian Miniatura, Mariusz Gajda

摘要:

我们考虑一个简单的实验装置,基于谐波约束,其中玻色-爱因斯坦凝聚体和弱相互作用碱原子的热云被困在两个不同的容器连接的一个狭窄的通道。使用经典场近似,如J. Phys. B 40,R1(2007)中所述,并在Phys. Rev. A 81,013629(2010)中针对任意捕获势进行了优化,我们从理论上研究了著名的超流氦喷泉效应的模拟。我们表明,这种热机械效应可能确实在这个系统中观察到。通过分析系统的动力学,我们能够识别的超流和正常组件的流动,以及区分冷凝物馏分从超流组件。我们表明,超流分量可以很容易地从较冷的容器流到较热的一个,而正常的组件实际上是在后者阻塞。

英文摘要:

We consider a simple experimental setup, based on a harmonic confinement, where a Bose-Einstein condensate and a thermal cloud of weakly interacting alkali atoms are trapped in two different vessels connected by a narrow channel. Using the classical field approximation, as described in J. Phys. B 40, R1 (2007) and optimized in Phys. Rev. A 81, 013629 (2010) for an arbitrary trapping potential, we theoretically investigate the analog of the celebrated superfluid helium fountain effect. We show that this thermo-mechanical effect might indeed be observed in this system. By analyzing the dynamics of the system, we are able to identify the superfluid and normal components of the flow as well as to distinguish the condensate fraction from the superfluid component. We show that the superfluid component can easily flow from the colder vessel to the hotter one while the normal component is practically blocked in the latter.

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。

↑