›› 2014, Vol. 23 ›› Issue (7): 70307-070307.doi: 10.1088/1674-1056/23/7/070307

• GENERAL • 上一篇    下一篇

Adiabatic tunneling of Bose-Einstein condensates with modulated atom interaction in a double-well potential

辛晓天, 黄芳, 徐志君, 李海彬   

  1. Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
  • 收稿日期:2013-11-04 修回日期:2013-12-30 出版日期:2014-07-15 发布日期:2014-07-15

Adiabatic tunneling of Bose-Einstein condensates with modulated atom interaction in a double-well potential

Xin Xiao-Tian (辛晓天), Huang Fang (黄芳), Xu Zhi-Jun (徐志君), Li Hai-Bin (李海彬)   

  1. Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
  • Received:2013-11-04 Revised:2013-12-30 Online:2014-07-15 Published:2014-07-15
  • Contact: Li Hai-Bin E-mail:hbli@zjut.edu.cn
  • About author:03.75.Kk; 03.75.Lm

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摘要： We study the adiabatic tunneling of Bose-Einstein condensates in a symmetric double-well potential when the interaction strength between the atoms is modulated linearly or in a cosine periodic form. It is shown that the system evolves along a nonlinear eigenstate path. In the case of linear modulation under the adiabatic approximation conditions, the tunneling probability of the condensate atoms to the other potential well is half. However, when the system is periodically scanned in the adiabatic process, we find an interesting phenomenon. A small change in the cycle period can lead to the condensate atoms returning to the right well or tunneling to the left well. The system comes from a linear eigenstate back to a nonlinear one, which is completely different from the linear eigenstate evolution. We explain the results by using the energy level and the phase diagram.

关键词: adiabatic tunneling, Bose-Einstein condensates, double-well potential

Abstract: We study the adiabatic tunneling of Bose-Einstein condensates in a symmetric double-well potential when the interaction strength between the atoms is modulated linearly or in a cosine periodic form. It is shown that the system evolves along a nonlinear eigenstate path. In the case of linear modulation under the adiabatic approximation conditions, the tunneling probability of the condensate atoms to the other potential well is half. However, when the system is periodically scanned in the adiabatic process, we find an interesting phenomenon. A small change in the cycle period can lead to the condensate atoms returning to the right well or tunneling to the left well. The system comes from a linear eigenstate back to a nonlinear one, which is completely different from the linear eigenstate evolution. We explain the results by using the energy level and the phase diagram.

Key words: adiabatic tunneling, Bose-Einstein condensates, double-well potential

中图分类号:  (Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow)

  • 03.75.Kk
03.75.Lm (Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations)