中国物理B ›› 2007, Vol. 16 ›› Issue (2): 533-536.doi: 10.1088/1009-1963/16/2/041

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Persistent spin current in a quantum wire with weak Dresselhaus spin--orbit coupling

盛威1, 王羿1, 周光辉2   

  1. (1)Department of Physics, Hunan Normal University, Changsha 410081, China; (2)Department of Physics, Hunan Normal University, Changsha 410081, China;International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China
  • 收稿日期:2006-07-05 修回日期:2006-08-31 出版日期:2007-02-20 发布日期:2007-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10574042) and the Scientific Research Fund of Hunan Provincial Education Department (Grant No 04A031).

Persistent spin current in a quantum wire with weak Dresselhaus spin--orbit coupling

Sheng Wei(盛威)a), Wang Yi(王羿)a), and Zhou Guang-Hui(周光辉)a)b)†   

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110015, China
  • Received:2006-07-05 Revised:2006-08-31 Online:2007-02-20 Published:2007-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10574042) and the Scientific Research Fund of Hunan Provincial Education Department (Grant No 04A031).

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摘要： The spin current in a parabolically confined semiconductor heterojunction quantum wire with Dresselhaus spin--orbit coupling is theoretically studied by using the perturbation method. The formulae of the elements for linear and angular spin current densities are derived by using the recent definition for spin current based on spin continuity equation. It is found that the spin current in this Dresselhaus spin--orbit coupling quantum wire is antisymmetrical, which is different from that in Rashba model due to the difference in symmetry between these two models. Some numerical examples for the result are also demonstrated and discussed.

关键词: semiconductor heterojunction quantum wire, Dresslhuaus spin--orbit coupling, spin current

Abstract: The spin current in a parabolically confined semiconductor heterojunction quantum wire with Dresselhaus spin--orbit coupling is theoretically studied by using the perturbation method. The formulae of the elements for linear and angular spin current densities are derived by using the recent definition for spin current based on spin continuity equation. It is found that the spin current in this Dresselhaus spin--orbit coupling quantum wire is antisymmetrical, which is different from that in Rashba model due to the difference in symmetry between these two models. Some numerical examples for the result are also demonstrated and discussed.

Key words: semiconductor heterojunction quantum wire, Dresslhuaus spin--orbit coupling, spin current

中图分类号:  (Persistent currents)

  • 73.23.Ra
71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 72.25.Dc (Spin polarized transport in semiconductors) 73.63.Nm (Quantum wires)