中国物理B ›› 2011, Vol. 20 ›› Issue (1): 10309-010309.doi: 10.1088/1674-1056/20/1/010309

• GENERAL • 上一篇    下一篇

Dark soliton in one-dimensional Bose–Einstein condensate under a periodic perturbation of trap

刘超飞, 胡柯, 胡涛, 唐翌   

  1. Department of Physics, Xiangtan University, Xiangtan 411105, China
  • 收稿日期:2010-03-07 修回日期:2010-04-20 出版日期:2011-01-15 发布日期:2011-01-15
  • 基金资助:
    Project supported by the General Project of Hunan Provincial Educational Department of China (Grant No. 07C754), and the National Natural Science Foundation of China (Grant No. 30570432).

Dark soliton in one-dimensional Bose–Einstein condensate under a periodic perturbation of trap

Liu Chao-Fei(刘超飞),Hu Ke(胡柯),Hu Tao(胡涛),and Tang Yi(唐翌)†   

  1. Department of Physics, Xiangtan University, Xiangtan 411105, China
  • Received:2010-03-07 Revised:2010-04-20 Online:2011-01-15 Published:2011-01-15
  • Supported by:
    Project supported by the General Project of Hunan Provincial Educational Department of China (Grant No. 07C754), and the National Natural Science Foundation of China (Grant No. 30570432).

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摘要： The perturbation of a confining trap leads to the collective oscillation of a Bose--Einstein condensate, thereby the propagation of a dark soliton in the condensate is affected. In this study, periodic perturbation is employed to match the soliton oscillation. We find that the soliton dynamics depends sensitively on the coupling between the moving direction of the trap and that of the soliton. The soliton energy/depth evolves periodically, and a relevant shift in the soliton trajectory occurs as compared with the unperturbed case. Overall, the soliton oscillation frequency changes little even if the perturbation amplitude and frequency vary.

Abstract: The perturbation of a confining trap leads to the collective oscillation of a Bose–Einstein condensate, thereby the propagation of a dark soliton in the condensate is affected. In this study, periodic perturbation is employed to match the soliton oscillation. We find that the soliton dynamics depends sensitively on the coupling between the moving direction of the trap and that of the soliton. The soliton energy/depth evolves periodically, and a relevant shift in the soliton trajectory occurs as compared with the unperturbed case. Overall, the soliton oscillation frequency changes little even if the perturbation amplitude and frequency vary.

Key words: Bose–Einstein condensate, dark soliton

中图分类号:  (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)

  • 03.75.Lm
05.45.Yv (Solitons)