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  

Effect of External Magnetic Field on the Spin-Dependent Transport and Shot Noise of a Ferromagnetic/Semiconductor/Ferromagnetic Heterojunction with Double δ Tunnel Barrier

作　　者：杜坚[1] 李志文[1] 张鹏[2] 

机构地区：[1]承德民族师范高等专科学校物理系,承德067000 [2]河北师范大学物理科学与信息工程学院,石家庄050016

出　　处：《Journal of Semiconductors》2008年第6期1147-1151,共5页半导体学报（英文版）

摘　　要：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.The paper elaborates on the characteristics of the transmission coefficient and the shot noise of a ferromagnetic/semiconductor/ferromagnetic heterojunction with double δ tunnel barrier in the existing external magnetic field. The effects of the quantum size and Rashba spin-orbit coupling are discussed. The results show that the transmission coefficient and the shot noise continuously oscillate as the length of the semi-conductor changes when the spin-dependent electron tunnels through the hetero-junction. The frequency of the transmission coefficient and the shot noise increase as the Rashba spin-orbit coupling and the external magnetic increase. The frequency of the shot noise will change as the angle of the external magnetic changes. The existence of the double δ tunnel barrier increases the swing of the transmission coefficient of the spin-electron.

关 键 词：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 

分 类 号：O471.1[理学—半导体物理]