Observation of Persistent Flow of a Bose-Einstein Condensate in a Toroidal Trap
Observation of Persistent Flow of a Bose-Einstein Condensate in a Toroidal Trap
复制标题
环形陷阱中玻色-爱因斯坦凝聚态持续流动的观察
DOI：
10.1364/qao.2007.qme24
复制
发表时间：
2007
影响因子：
3.3
通讯作者：
W. Phillips
中科院分区：
文献类型：
--
作者：
K. Helmerson;C. Ryu;M. Andersen;P. Cladé;V. Natarajan;A. Ramanathan;W. Phillips
我们观察到玻色凝聚原子在环形阱中的持续流动。该流动持续不衰减长达10秒，并通过将一个单位的轨道角动量从拉盖尔-高斯光子转移到每个原子来启动。稳定的流动是唯一可能的，当陷阱是多连接的，并观察到与BEC分数小至15%。我们还创建了两个单位的角动量的流动，并观察到它分裂成两个单电荷的漩涡时，陷阱的几何形状从多到简单连接。
We have observed the persistent flow of Bose-condensed atoms in a toroidal trap. The flow persists without decay for up to 10 s, and was initiated by transferring one unit of the orbital angular momentum from Laguerre-Gaussian photons to each atom. Stable flow was only possible when the trap was multiply-connected, and was observed with a BEC fraction as small as 15%. We also created flow with two units of angular momentum, and observed its splitting into two singly-charged vortices when the trap geometry was changed from multiply- to simply-connected.