中国物理B ›› 2005, Vol. 14 ›› Issue (5): 1021-1024.doi: 10.1088/1009-1963/14/5/029

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Effects of spin-orbit interaction and magnetic field on the electron transport in quasi-1D ferromagnetic/semiconductor/ferromagnetic system　　

李伯臧1, 李玉现2   

  1. (1)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China； Department of Physics, Hebei Normal University, Shijiazhuang 050016, China
  • 收稿日期:2004-10-22 修回日期:2005-01-06 出版日期:2005-05-19 发布日期:2005-05-19
  • 基金资助:
    国家自然科学基金资助（10074075）。

Effects of spin-orbit interaction and magnetic field on the electron transport in quasi-1D ferromagnetic/semiconductor/ferromagnetic system

Li Yu-Xian (李玉现)ab, Li Bo-Zang (李伯臧)a   

  1. a Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Hebei Normal University, Shijiazhuang 050016, China
  • Received:2004-10-22 Revised:2005-01-06 Online:2005-05-19 Published:2005-05-19
  • Supported by:
    国家自然科学基金资助（10074075）。

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摘要： Based on the transfer matrix method, we investigate the effects of Rashba spin-orbit interaction and magnetic field on the electron transport in a quasi one-dimensional FM/S/FM system, where FM and S represent the ferromagnetic metal and semiconductor, respectively. The results show that the oscillating scope of the transmission increases with the magnetic field increasing. In the antiferromagnetic alignment, the spin-up and spin-down electrons have the same contribution to the transmission even if a magnetic field is applied. In the ferromagnetic alignment, however, at certain strengths of Rashba spin-orbit interaction and of magnetic field, the transmission coefficient for spin-up electrons is bigger than that for spin-down electrons, and the sign of the spin polarization changes, which is opposite to that in the absence of the magnetic field.

关键词: Rashba spin-orbit interaction, magnetic field, transmission, spin filter effect

Abstract: Based on the transfer matrix method, we investigate the effects of Rashba spin-orbit interaction and magnetic field on the electron transport in a quasi one-dimensional FM/S/FM system, where FM and S represent the ferromagnetic metal and semiconductor, respectively. The results show that the oscillating scope of the transmission increases with the magnetic field increasing. In the antiferromagnetic alignment, the spin-up and spin-down electrons have the same contribution to the transmission even if a magnetic field is applied. In the ferromagnetic alignment, however, at certain strengths of Rashba spin-orbit interaction and of magnetic field, the transmission coefficient for spin-up electrons is bigger than that for spin-down electrons, and the sign of the spin polarization changes, which is opposite to that in the absence of the magnetic field.

Key words: Rashba spin-orbit interaction, magnetic field, transmission, spin filter effect

中图分类号: 

  • 7210