中国物理B ›› 2008, Vol. 17 ›› Issue (3): 764-770.doi: 10.1088/1674-1056/17/3/005

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The dynamics of triple-well trapped Bose--Einstein condensates with atoms feeding and loss effects

穆爱霞, 周小燕, 薛具奎   

  1. College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China
  • 收稿日期:2007-04-27 修回日期:2007-09-12 出版日期:2008-03-04 发布日期:2008-03-04
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774120 and 10475066), the Natural Science Foundation of Gansu Province, China (Grant No 3ZS051-A25-013), and the Natural Science Foundation of Northwest Normal University of China (Grant No NWNU-KJCXGC-03-17).

The dynamics of triple-well trapped Bose--Einstein condensates with atoms feeding and loss effects

Mu Ai-Xia(穆爱霞), Zhou Xiao-Yan(周小燕), and Xue Ju-Kui(薛具奎)†   

  1. College of Physics and Electronics Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2007-04-27 Revised:2007-09-12 Online:2008-03-04 Published:2008-03-04
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10774120 and 10475066), the Natural Science Foundation of Gansu Province, China (Grant No 3ZS051-A25-013), and the Natural Science Foundation of Northwest Normal University of China (Grant No NWNU-KJCXGC-03-17).

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摘要： In this paper, we consider the macroscopic quantum tunnelling and self-trapping phenomena of Bose--Einstein condensates (BECs) with three-body recombination losses and atoms feeding from thermal cloud in triple-well potential. Using the three-mode approximation, three coupled Gross--Pitaevskii equations (GPEs), which describe the dynamics of the system, are obtained. The corresponding numerical results reveal some interesting characteristics of BECs for different scattering lengths. The self-trapping and quantum tunnelling both are found in zero-phase and \pi-phase modes. Furthermore, we observe the quantum beating phenomenon and the resonance character during the self-trapping and quantum tunnelling. It is also shown that the initial phase has a significant effect on the dynamics of the system.

关键词: Bose--Einstein condensates, three-body recombination and atoms feeding, quantum self-trapping, quantum tunnelling

Abstract: In this paper, we consider the macroscopic quantum tunnelling and self-trapping phenomena of Bose--Einstein condensates (BECs) with three-body recombination losses and atoms feeding from thermal cloud in triple-well potential. Using the three-mode approximation, three coupled Gross--Pitaevskii equations (GPEs), which describe the dynamics of the system, are obtained. The corresponding numerical results reveal some interesting characteristics of BECs for different scattering lengths. The self-trapping and quantum tunnelling both are found in zero-phase and $\pi$-phase modes. Furthermore, we observe the quantum beating phenomenon and the resonance character during the self-trapping and quantum tunnelling. It is also shown that the initial phase has a significant effect on the dynamics of the system.

Key words: Bose--Einstein condensates, three-body recombination and atoms feeding, quantum self-trapping, quantum tunnelling

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) 42.50.Md (Optical transient phenomena: quantum beats, photon echo, free-induction decay, dephasings and revivals, optical nutation, and self-induced transparency)