Pure spin current in a three-terminal spin device in the presence of Rashba spin-orbit interaction

Abstract

The authors propose a spin device with three normal metal leads via a quantum dot in the presence of Rashba spin-orbit interaction, which operates independently on a magnetic field or ferromagnetic metals. It is shown that a pure spin current or a fully spin-polarized current can be obtained by modulating one of the voltages applied to three terminals. It further demonstrates the dependence of the pure spin current on the strength of Rashba spin-orbit interaction and the configuration of the three leads.