Spin-polarized current induced by three terminal geometry

We investigate numerically the spin polarization of the current in the presence of spin–orbit interaction with three terminal geometry proposed by Kiselev and Kim (Appl. Phys. Lett. 78 (2001) 775). We obtained high spin polarization at the energy just before a new channel opens. To obtain higher polarization, we then consider the geometry which consists of the combination of two T-shaped blocks. This two blocks configuration results in almost 100% polarization. We also investigate the effect of disorder by including a random potential and taking ensemble average. This not only makes the reduction of the spin polarization but also shifts the peak of the polarization towards the lower energy regime.