中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2670-2677.doi: 10.1088/1674-1056/17/7/052

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Field-assisted electron transport through a symmetric double-well structure with spin--orbit coupling and the Fano-resonance induced spin filtering

张存喜1, 梁九卿1, 聂一行2   

  1. (1)Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China; (2)Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China;Department of Physics, Yanbei Normal Institute, Datong 037000, China
  • 收稿日期:2008-03-09 修回日期:2008-04-07 出版日期:2008-07-09 发布日期:2008-07-09
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10475053, 10775091 and 10774094) and the Shanxi Natural Science Foundation, China (Grant No 20051002).

Field-assisted electron transport through a symmetric double-well structure with spin--orbit coupling and the Fano-resonance induced spin filtering

Zhang Cun-Xi(张存喜)a), Nie Yi-Hang(聂一行)a)b)†, and Liang Jiu-Qing(梁九卿)a)   

  1. a Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China; b Department of Physics, Yanbei Normal Institute, Datong 037000, China
  • Received:2008-03-09 Revised:2008-04-07 Online:2008-07-09 Published:2008-07-09
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 10475053, 10775091 and 10774094) and the Shanxi Natural Science Foundation, China (Grant No 20051002).

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摘要： We have investigated theoretically the field-driven electron-transport through a double-quantum-well semiconductor-heterostructure with spin--orbit coupling. The numerical results demonstrate that the transmission spectra are divided into two sets due to the bound-state level-splitting and each set contains two asymmetric resonance peaks which may be selectively suppressed by changing the difference in phase between two driving fields. When the phase difference changes from $0$ to $\pi$, the dip of asymmetric resonance shifts from one side of resonance peak to the other side and the asymmetric Fano resonance degenerates into the symmetric Breit--Wigner resonance at a critical value of phase difference. Within a given range of incident electron energy, the spin polarization of transmission current is completely governed by the phase difference which may be used to realize the tunable spin filtering.

关键词: Fano effect, Floquet channel, spin--orbit coupling

Abstract: We have investigated theoretically the field-driven electron-transport through a double-quantum-well semiconductor-heterostructure with spin--orbit coupling. The numerical results demonstrate that the transmission spectra are divided into two sets due to the bound-state level-splitting and each set contains two asymmetric resonance peaks which may be selectively suppressed by changing the difference in phase between two driving fields. When the phase difference changes from $0$ to $\pi$, the dip of asymmetric resonance shifts from one side of resonance peak to the other side and the asymmetric Fano resonance degenerates into the symmetric Breit--Wigner resonance at a critical value of phase difference. Within a given range of incident electron energy, the spin polarization of transmission current is completely governed by the phase difference which may be used to realize the tunable spin filtering.

Key words: Fano effect, Floquet channel, spin--orbit coupling

中图分类号:  (Quantum wells)

  • 73.21.Fg
71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect) 72.10.-d (Theory of electronic transport; scattering mechanisms) 72.25.Dc (Spin polarized transport in semiconductors) 72.25.Mk (Spin transport through interfaces) 73.40.Lq (Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)