Spin polarization and separation in a triple-quantum-dot ring

摘要

Electron transport through a triple-quantum-clot ring with three terminals is studied theoretically. By introducing the local Rashba spin-orbit interaction in an individual quantum dot, we find that ail incident electron from one terminal can select a specific terminal to depart from the quantum dot ring according to its spin state. As a result, spin polarization and spin separation can be simultaneously realized in this structure.