Streda P, Seba P
Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, CZ-162 53 Praha, Czech Republic.
Phys Rev Lett. 2003 Jun 27;90(25 Pt 1):256601. doi: 10.1103/PhysRevLett.90.256601. Epub 2003 Jun 23.
We theoretically analyze the possibility to use a ferromagnetic gate as a spin-polarization filter for one-dimensional electron systems formed in semiconductor heterostructures showing strong Rashba spin-orbit interaction. The proposed device is based on the effect of the breaking time-reversal symmetry due to the presence of weak magnetic fields. For a proper strength and magnetic field orientation there appears an energy interval in the electron energy spectrum at which the orientation of spin states is controlled by the direction of the electron velocity. It leads to the natural spin polarization of the electron current if the Fermi energy falls into this energy interval.
我们从理论上分析了使用铁磁栅极作为自旋极化滤波器的可能性，该滤波器用于在表现出强Rashba自旋轨道相互作用的半导体异质结构中形成的一维电子系统。所提出的器件基于由于存在弱磁场而导致的时间反演对称性破缺效应。对于适当的强度和磁场取向，在电子能谱中会出现一个能量区间，在该区间内自旋态的取向由电子速度的方向控制。如果费米能量落入这个能量区间，就会导致电子电流的自然自旋极化。
