Vortex-splitting and phase-separating instabilities of coreless vortices in F=1 spinor Bose-Einstein condensates

被引：23
作者：
Takahashi, M. [1 ]
Pietila, V. [2 ,4 ]
Mottonen, M. [2 ,3 ,4 ]
Mizushima, T. [1 ]
Machida, K. [1 ]
机构：
[1] Okayama Univ, Dept Phys, Okayama 7008530, Japan
[2] Aalto Univ, Dept Appl Phys, COMP, FI-02015 Helsinki, Finland
[3] Aalto Univ, Low Temp Lab, FI-02015 Helsinki, Finland
[4] Univ New S Wales, Ctr Excellence Quantum Comp Technol, Australian Res Council, Sydney, NSW 2052, Australia
来源：
PHYSICAL REVIEW A | 2009年 / 79卷 / 02期
关键词：
Bose-Einstein condensation; phase separation; spin-spin interactions; vortices; QUANTUM VORTEX; COLLECTIVE EXCITATIONS; OSCILLATIONS; CREATE; GAS;
D O I：
10.1103/PhysRevA.79.023618
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The low-lying excitations of coreless vortex states in F=1 spinor Bose-Einstein condensates (BECs) are theoretically investigated using the Gross-Pitaevskii and Bogoliubov-de Gennes equations. The spectra of the elementary excitations are calculated for different spin-spin interaction parameters and ratios of the number of particles in each sublevel. There exist dynamical instabilities of the vortex state which are suppressed by ferromagnetic interactions, and, conversely, enhanced by antiferromagnetic interactions. In both of the spin-spin interaction regimes, we find vortex-splitting instabilities in analogy with scalar BECs. In addition, a phase-separating instability is found in the antiferromagnetic regime.
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页数：10
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