Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates
Crossover between Kelvin-Helmholtz and counter-superflow instabilities in two-component Bose-Einstein condensates
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DOI：
10.1103/physreva.82.063604
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发表时间：
2010-09
影响因子：
2.9
通讯作者：
Naoya Suzuki;H. Takeuchi;K. Kasamatsu;M. Tsubota;H. Saito
中科院分区：
文献类型：
--
作者：
Naoya Suzuki;H. Takeuchi;K. Kasamatsu;M. Tsubota;H. Saito
使用平均场和 Bogoliubov 分析研究了两个相对运动的玻色-爱因斯坦凝聚体之间界面的动态不稳定性。当界面厚度远小于不稳定界面模式的波长时，开尔文-亥姆霍兹不稳定性占主导地位，而在相反的情况下，反超流不稳定性占主导地位。这些不稳定性不仅出现在不混溶系统中，而且也出现在由外部电势产生界面的混溶系统中。由这些不稳定性引起的动力学在旋转捕获的冷凝物中得到了数值证明。
Dynamical instabilities at the interface between two Bose-Einstein condensates that are moving relative to each other are investigated using mean-field and Bogoliubov analyses. Kelvin-Helmholtz instability is dominant when the interface thickness is much smaller than the wavelength of the unstable interface mode, whereas the counter-superflow instability becomes dominant in the opposite case. These instabilities emerge not only in an immiscible system but also in a miscible system where an interface is produced by external potential. Dynamics caused by these instabilities are numerically demonstrated in rotating trapped condensates.