中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2670-2677.doi: 10.1088/1674-1056/17/7/052
张存喜1, 梁九卿1, 聂一行2
Zhang Cun-Xi(张存喜)a), Nie Yi-Hang(聂一行)a)b)†, and Liang Jiu-Qing(梁九卿)a)
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.
中图分类号: (Quantum wells)