量子环终端布局对自旋输运的影响  

The Effect of Distribution of Quantum Rings Terminals on Spin Transportation

作　　者：杜坚[1] 

机构地区：[1]承德民族师范高等专科学校物理系,河北承德067000

出　　处：《固体电子学研究与进展》2010年第2期184-187,共4页Research & Progress of SSE

基　　金：河北省教育厅自然科学研究指导项目(Z2008103)

摘　　要：研究了量子环透射终端与入射终端相对位置改变时的变化规律。研究结果表明:透射概率和自旋极化率随半导体环尺寸的增大作周期性振荡,都与透射终端位置的改变相关;铁磁电极、Rashba自旋轨道耦合、外加磁场对透射概率和自旋极化率具有不同影响;透射概率随δ势垒强度增加单调减小,自旋极化率随δ势垒强度增加单调增大。We report the transmission coefficient for different positions of transmission and incidence terminals.The investigated results show that both transmission coefficient and spin-polarized efficiency were periodic oscillations with increasing semiconductor ring sizes,which depended on the changes of transmission terminals positions.The different effects of the ferromagnetic electrode,Rashba spin-orbit coupling and applied magnetic field on spin-polarized efficiency and transmission coefficient were also considered.The tunneling coefficient decreases monotonically with the δ barrier strength,while spin-polarized efficiency increased with the δ barrier strength.

关 键 词：量子环 RASHBA自旋轨道耦合 AB磁通 透射概率 自旋极化率 δ势垒 

分 类 号：O471.1[理学—半导体物理]