A Spin-Polarized Current Direction Controller Based on a Nonuniform Rashba Quantum Wire

A spin-polarized current direction controller scheme is proposed based on a nonuniform Rashba quantum wire. It is shown that |P_z^LR|=|P_z^RL|, whereas their signs are opposite, and the effect of this phenomenon is due to the two broken symmetries and the unbroken C₂-rotation symmetry of the investigated system. In addition, the spin-polarized current is nonzero even with a strong disorder strength, which demonstrates that this structure may be utilized for potential applications.