Spontaneous Spin Polarization of Electrons by Diluted Magnetic Heterostructures

• 作者: Amalorpavam John Peter Chang Woo Lee
• 来源期刊: 现代物理(英文)
• 学科: 物理学
• 关键词: SPIN Polarized Transport SPIN Injection SPIN-ORBIT Coupling Resonant TUNNELING
• 年，卷（期）: xdwlyw_2011,（11）
• 页码范围: 1272-1279
• 页数: 8页
• 分类号: O469

摘要

The spin dependent electron transmission phenomenon in a diluted resonant semiconductor heterostructure is employed theoretically to investigate the output transmission current polarization at zero magnetic field. Transparency of electron transmission is calculated as a function of electron energy and the well width, within the one electron band approximation along with the spin orbit interaction. Enhanced spin-polarized resonant tunneling in the heterostructure due to Dresselhaus and Rashba spin-orbit coupling induced splitting of the resonant level is observed. We predict that a spin-polarized current spontaneously emerges in this heterostructure and we estimate theoretically that the polarization can reach 40%. This effect could be employed in the fabrication of spin filters, spin injectors and detectors based on non-magnetic semiconductors.