Manipulating Dresselhaus-spin-orbit-coupling induced electron-spin polarization via δ-doping in 3-layered semiconductor heterostructure

We report a theoretical exploration on the control of the Dresselhaus －spin-orbit －coupling (SOC) induced spin polarization via the δ-doping for electrons in the 3-layered semiconductor heterostructure (3-LSH). It is shown that an obvious electron-spin polarization effect still exists when a δ-doping is introduced inside. Moreover, both magnitude and sign of the spin polarization can be controlled by adjusting the weight or position of the δ-doping. Therefore, spin-polarized electrons can be manipulated by the δ-doping technique, and the considered 3-LSH can be used as a structurally-controllable spin filter, which may be helpful for spintronics device applications.