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By developing the multiple-scale method,we study analytically the dynamical properties of soliton in a quasi-two-dimensional Bose-Einstein condensate. For the repulsive inter-atomic interaction,a unstable dark soliton can be found in the condensate,which would evolve into ring dark soliton with small amplitude. Especially,it is shown that the ring dark soliton has dynamic stability.
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Keywords:
- Bose-Einstein condensates /
- multiple-scale method /
- ring dark soliton
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