Structurally manipulating electron-spin polarization via δ-doping in a magnetic nanostructure

作者：Mao‐Wang Lu, Zhiyong Wang, Yuli Liang, Yan-Bo AN, Li-Qiong Li · 发表于：Applied Physics Letters · 年份：2013 · DOI：10.1063/1.4775761 · 被引用次数：57 · 研究领域：Quantum and electron transport phenomena、Magnetic properties of thin films、Semiconductor materials and devices

We theoretically investigate the control of the electron-spin polarization in a spin filter by a tunalbe δ-doping, where the device and the δ-doping can be realized experimentally by depositing a ferromagnetic stripe on top of semiconductor heterostructure and using molecular beam epitaxy or metal-organic chemical-vapor deposition, respectively. The δ-doping dependent transmission and conductance are numerically calculated for InAs material system. It is shown that both amplitude and sign of electron-spin polarization vary dramatically with the weight and/or the location of the δ-doping. Thus, it is possible to open a new door for effectively manipulating spin-polarized source, and the considered nanostructure can serve as a spin filter with a structurally controllable spin polarization by the δ-doping.