Splitting Instability of a Multiply Charged Vortex in a Bose-Einstein Condensate
Splitting Instability of a Multiply Charged Vortex in a Bose-Einstein Condensate
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DOI：
10.1103/physreva.70.043610
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发表时间：
2004-02
影响因子：
2.9
通讯作者：
Y. Kawaguchi;T. Ohmi
中科院分区：
文献类型：
--
作者：
Y. Kawaguchi;T. Ohmi
在零温下的简谐势中，我们考虑了玻色-爱因斯坦凝聚体中多电荷涡旋分裂成单电荷涡旋的机制。Bogoliubov方程支持具有复本征频率的不稳定模(CE模)，这导致了不受热原子影响的分裂不稳定性。对激发光谱的研究表明，负能(NE)模对CE模的出现起着重要作用。分裂中的涡型由相关的NE模的角动量决定。这种结构也被含时Gross-Pitaevskii方程的数值模拟所证实。
We consider the splitting mechanism of a multiply charged vortex into singly charged vortices in a Bose-Einstein condensate confined in a harmonic potential at zero temperature. The Bogoliubov equations support unstable modes with complex eigenfrequencies (CE modes), which cause the splitting instability without the influence of thermal atoms. The investigation of the excitation spectra shows that the negative-energy (NE) mode plays an important role in the appearance of the CE modes. The configuration of vortices in splitting is determined by the angular momentum of the associated NE mode. This structure has also been confirmed by the numerical simulation of the time-dependent Gross-Pitaevskii equation.