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Chin. Phys. B, 2008, Vol. 17(7): 2670-2677    DOI: 10.1088/1674-1056/17/7/052
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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)
a Department of Physics and Institute of Theoretical Physics, Shanxi University, Taiyuan 030006, China; b Department of Physics, Yanbei Normal Institute, Datong 037000, China
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.
Keywords:  Fano effect      Floquet channel      spin--orbit coupling  
Received:  09 March 2008      Revised:  07 April 2008      Accepted manuscript online: 
PACS:  73.21.Fg (Quantum wells)  
  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)  
Fund: 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).

Cite this article: 

Zhang Cun-Xi(张存喜), Nie Yi-Hang(聂一行), and Liang Jiu-Qing(梁九卿) Field-assisted electron transport through a symmetric double-well structure with spin--orbit coupling and the Fano-resonance induced spin filtering 2008 Chin. Phys. B 17 2670

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