Splitting instability of a multiply charged vortex in a Bose-Einstein condensate

被引：98

作者：

Kawaguchi, Y ^{[1
]}

Ohmi, T ^{[1
]}

机构：

[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW A | 2004年 / 70卷 / 04期

关键词：

D O I：

10.1103/PhysRevA.70.043610

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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.

引用

页码：043610 / 1

页数：7

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