Department of Physics, Shanghai Jiao Tong University, Shanghai, People's Republic of China.
J Phys Condens Matter. 2010 Apr 7;22(13):135301. doi: 10.1088/0953-8984/22/13/135301. Epub 2010 Mar 12.
We investigate the electron transport through a mesoscopic ring side-coupled with a quantum dot (QD) in the presence of Rashba spin-orbit (SO) interaction. It is shown that both the Fano resonance and the spin interference effects play important roles in the electron transport properties. As the QD level is around the Fermi energy, the total conductance shows a typical Fano resonance line shape. By applying an electrical gate voltage to the QD, the total transmission through the system can be strongly modulated. By threading the mesoscopic ring with a magnetic flux, the time-reversal symmetry of the system is broken, and a spin polarized current can be obtained even though the incident current is unpolarized.
我们研究了在拉什巴自旋轨道（SO）相互作用存在的情况下，介观环与量子点（QD）侧耦合的电子输运。结果表明，Fano 共振和自旋干涉效应都对电子输运性质起着重要作用。当 QD 能级接近费米能时，总电导率呈现出典型的 Fano 共振线型。通过对 QD 施加栅极电压，可以强烈调制系统的总透射率。通过在介观环中缠绕磁通量，系统的时间反演对称性被破坏，即使入射电流未极化，也可以获得自旋极化电流。
