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.
Received: 09 March 2008
Revised: 07 April 2008
Accepted manuscript online:
(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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