玻色子在弱连通库间的一维输运
One-dimensional transport of bosons between weakly linked reservoirs
摘要：
我们研究了超冷玻色原子通过一维通道的流动，该通道通过弱连接连接两个宏观三维玻色凝聚原子库，每个库和通道之间的势垒。我们认为水库在相等的化学势，使通过通道的准冷凝物的超流是纯粹由相位差，$2Φ$，水库之间的印记。我们发现，超流从来没有标准的约瑟夫森形式$\sim \sin 2Φ$。相反，超流在$2Φ=\pmπ$处不连续地翻转方向，并具有亚稳态分支。我们表明，这些功能是强大的，而不是模糊的波动或相位滑移。我们描述了一个可能的实验装置观察这些现象。
英文摘要：
We study a flow of ultracold bosonic atoms through a one-dimensional channel that connects two macroscopic three-dimensional reservoirs of Bose-condensed atoms via weak links implemented as potential barriers between each of the reservoirs and the channel. We consider reservoirs at equal chemical potentials so that a superflow of the quasi-condensate through the channel is driven purely by a phase difference, $2Φ$, imprinted between the reservoirs. We find that the superflow never has the standard Josephson form $\sim \sin 2Φ$. Instead, the superflow discontinuously flips direction at $2Φ=\pmπ$ and has metastable branches. We show that these features are robust and not smeared by fluctuations or phase slips. We describe a possible experimental setup for observing these phenomena.
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