中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1748-1752.doi: 10.1088/1009-1963/16/6/045

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Electron transport for a laser-irradiated quantum channel with Rashba spin--orbit coupling

赵华1, 周光辉1, 廖文虎2   

  1. (1)Department of Physics, Hunan Normal University, Changsha 410081, China; (2)Department of Physics, Zunyi Normal College, Zunyi {rm 563002, China
  • 收稿日期:2006-09-27 修回日期:2006-11-21 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10574042), and the Hunan Provincial Natural Science Foundation of China (Grant No 06JJ2097).

Electron transport for a laser-irradiated quantum channel with Rashba spin--orbit coupling

Zhao Hua(赵华)a), Liao Wen-Hu(廖文虎)b), and Zhou Guang-Hui(周光辉)a)†   

  1. a Department of Physics, Hunan Normal University, Changsha 410081, China; b Department of Physics, Zunyi Normal College, Zunyi 563002, China
  • Received:2006-09-27 Revised:2006-11-21 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10574042), and the Hunan Provincial Natural Science Foundation of China (Grant No 06JJ2097).

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摘要： We investigate theoretically the electron transport for a two-level quantum channel (wire) with Rashba spin--orbit coupling under the irradiation of a longitudinally-polarized external laser field at low temperatures. Using the method of equation of motion for Keldysh nonequilibrium Green function, we examine the time-averaged spin polarized conductance for the system with photon polarization parallel to the wire direction. By analytical analysis and a few numerical examples, the interplay effects of the external laser field and the Rashba spin--orbit coupling on the spin-polarized conductance for the system are demonstrated and discussed. It is found that the longitudinally-polarized laser field can adjust the spin polarization rate and produce some photon sideband resonances of the conductance for the system.

关键词: Rashba quantum wire, laser field, spin-polarized transport, nonequilibrium Green function

Abstract: We investigate theoretically the electron transport for a two-level quantum channel (wire) with Rashba spin--orbit coupling under the irradiation of a longitudinally-polarized external laser field at low temperatures. Using the method of equation of motion for Keldysh nonequilibrium Green function, we examine the time-averaged spin polarized conductance for the system with photon polarization parallel to the wire direction. By analytical analysis and a few numerical examples, the interplay effects of the external laser field and the Rashba spin--orbit coupling on the spin-polarized conductance for the system are demonstrated and discussed. It is found that the longitudinally-polarized laser field can adjust the spin polarization rate and produce some photon sideband resonances of the conductance for the system.

Key words: Rashba quantum wire, laser field, spin-polarized transport, nonequilibrium Green function

中图分类号:  (Quantum wires)

  • 73.63.Nm
71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)