中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5462-5467.doi: 10.1088/1674-1056/18/12/055

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Spin-dependent electron transport of a waveguide with Rashba spin--orbit coupling in an electromagnetic field

李小毛1, 陈宇光2, 肖贤波3   

  1. (1)College of Science, Jiangxi Agricultural University, Nanchang 330045, China; (2)Department of Physics, Tongji University, Shanghai 200092, China; (3)Department of Physics, Tongji University, Shanghai 200092, China;College of Science, Jiangxi Agricultural University, Nanchang 330045, China
  • 收稿日期:2009-03-08 修回日期:2009-04-19 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10774112), and by the Science Foundation for Young Scientists of Jiangxi Agricultural University, China (Grant No 2219).

Spin-dependent electron transport of a waveguide with Rashba spin--orbit coupling in an electromagnetic field

Xiao Xian-Bo(肖贤波)a)b),Li Xiao-Mao(李小毛)b), and Chen Yu-Guang(陈宇光)a)†   

  1. a Department of Physics, Tongji University, Shanghai 200092, China; b College of Science, Jiangxi Agricultural University, Nanchang 330045, China
  • Received:2009-03-08 Revised:2009-04-19 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10774112), and by the Science Foundation for Young Scientists of Jiangxi Agricultural University, China (Grant No 2219).

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摘要： We investigate theoretically the spin-dependent electron transport in a straight waveguide with Rashba spin--orbit coupling (SOC) under the irradiation of a transversely polarized electromagnetic (EM) field. Spin-dependent electron conductance and spin polarization are calculated as functions of the emitting energy of electrons or the strength of the EM field by adopting the mode matching approach. It is shown that the spin polarization can be manipulated by external parameters when the strength of Rashba SOC is strong. Furthermore, a sharp step structure is found to exist in the total electron conductance. These results can be understood by the nontrivial Rashba subbands intermixing and the electron intersubband transition when a finite-range transversely polarized EM field irradiates a straight waveguide.

Abstract: We investigate theoretically the spin-dependent electron transport in a straight waveguide with Rashba spin--orbit coupling (SOC) under the irradiation of a transversely polarized electromagnetic (EM) field. Spin-dependent electron conductance and spin polarization are calculated as functions of the emitting energy of electrons or the strength of the EM field by adopting the mode matching approach. It is shown that the spin polarization can be manipulated by external parameters when the strength of Rashba SOC is strong. Furthermore, a sharp step structure is found to exist in the total electron conductance. These results can be understood by the nontrivial Rashba subbands intermixing and the electron intersubband transition when a finite-range transversely polarized EM field irradiates a straight waveguide.

Key words: waveguide, spin--orbit coupling, spin polarization

中图分类号:  (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

  • 71.70.Ej
72.25.Dc (Spin polarized transport in semiconductors) 73.40.Kp (III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)