Current production in ring condensates with a weak link
Current production in ring condensates with a weak link
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DOI：
10.1103/physreva.102.063302
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Axel Pérez-Obiol;J. Polo;T. Cheon
中科院分区：
文献类型：
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作者：
Axel Pérez-Obiol;J. Polo;T. Cheon
我们考虑吸引和排斥凝聚在一个环陷阱搅拌的弱链接，并分析了孤立子链的频谱拖动的链接，通过波函数，能量和电流的解析表达式。精确的演化电流的产生和破坏方面的缺陷形成的环和搅拌进行了研究。我们发现，任何激发态都可以通过两种方法耦合到基态：要么通过精确的周期来调整链接的强度和速度，避免临界速度和不稳定区域，要么通过设置辅助电位并在电位关闭时压印非线性相位来保持链接静止。我们还通过能量和电流的频谱分析磁滞循环。
We consider attractive and repulsive condensates in a ring trap stirred by a weak link, and analyze the spectrum of solitonic trains dragged by the link, by means of analytical expressions for the wave functions, energies and currents. The precise evolution of current production and destruction in terms of defect formation in the ring and in terms of stirring is studied. We find that any excited state can be coupled to the ground state through two proposed methods: either by adiabatically tuning the link's strength and velocity through precise cycles which avoid the critical velocities and thus unstable regions, or by having the link still while setting an auxiliary potential and imprinting a nonlinear phase as the potential is turned off. We also analyze hysteresis cycles through the spectrum of energies and currents.