Effect of External Magnetic Field on the Spin-Dependent Transport and Shot Noise of a Ferromagnetic/Semiconductor/Ferromagnetic Heterojunction with Double δ Tunnel Barrier
外加磁场对含双δ势垒的铁磁/半导体/铁磁异质结中自旋输运和散粒噪声的影响

Keywords: double tunnel barrier,ferromagnetic/semiconductor/ferromagnetic heterojunction,Rashba spin-orbit coupling,transmission coefficient,shot noise
势垒,铁磁/半导体/铁磁异质结,Rashba自旋轨道耦合效应,透射概率,散粒噪声

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Abstract:

研究了外磁场存在时,含双δ势垒的铁磁/半导体/铁磁异质结中自旋相关的透射概率和散粒噪声,讨论了量子尺寸效应和Rashba自旋轨道耦合效应.研究结果表明:不同自旋取向的电子隧穿异质结时,透射概率和散粒噪声随半导体长度的变化特性是作等幅振荡;外加磁场和Rashba自旋轨道耦合强度的增强都会加大透射概率和散粒噪声的振荡频率;外加磁场角度的改变会改变散粒噪声的振荡频率;双δ势垒的存在增大了自旋电子透射概率的振幅.

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