Hysteresis effects in rotating Bose-Einstein condensates
Hysteresis effects in rotating Bose-Einstein condensates
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DOI：
10.1103/physreva.74.043618
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发表时间：
2006-02
影响因子：
2.9
通讯作者：
B. Jackson;C. Barenghi
中科院分区：
文献类型：
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作者：
B. Jackson;C. Barenghi
我们研究了被限制在旋转各向异性阱中的稀玻色-爱因斯坦凝聚体中漩涡的形成。我们发现，凝结水获得的涡的数量和角动量取决于捕集器的旋转历史和凝结水最初存在的涡的数量。建立了一个基于流体动力学方程的简化模型，并用涡旋晶格存在时凝结水四极模式共振频率的移位来解释这种效应。发现了凝结水自旋向上和自旋向下响应的差异，表明该系统存在滞后现象。
We study the formation of vortices in a dilute Bose-Einstein condensate confined in a rotating anisotropic trap. We find that the number of vortices and angular momentum attained by the condensate depend upon the rotation history of the trap and on the number of vortices present in the condensate initially. A simplified model based on hydrodynamic equations is developed, and used to explain this effect in terms of a shift in the resonance frequency of the quadrupole mode of the condensate in the presence of a vortex lattice. Differences between the spin-up and spin-down response of the condensate are found, demonstrating hysteresis phenomena in this system.