与非共线铁磁引线耦合的双量子点环中电子的输运  

Electronic transport through a douboe-quantum-dot ring coupled to nincollinear ferromagnetic leads

作　　者：赵佳[1] 迟锋[1] 

机构地区：[1]渤海大学物理系,辽宁锦州121013

出　　处：《渤海大学学报（自然科学版）》2010年第3期268-271,共4页Journal of Bohai University:Natural Science Edition

基　　金：国家自然科学基金(No:10704011);辽宁省教育厅(No:2009A031)

摘　　要：用非平衡格林函数理论研究与两个铁磁引线连接的平行连耦合双量子点系统中电子输运性质。两个铁磁引线的磁矩相互成任意角度,即磁矩是非共线性的。通过调节磁矩间的角度,可以控制不同自旋方向电子的输运性质,从而能充分操作通过整个系统的电流和隧穿磁阻。两个铁磁弓I线磁矩间的相对角度对量子点中不同自旋电子的占据数有显著的影响,是决定电流和隧穿磁阻性质的内在机制。量子点间的耦合强度、量子点与引线的耦合强度等也会对系统的电流有明显的作用,从而提供了丰富的电流操控手段。本文研究的系统可以用作自旋阀,在自旋电子学器件中有实际的应用价值。Based on the non- equilibrium Green＇s function technique, electronic transport through a two parallel- coupled quantum dots is theoretically studied. The quantum dots are coupled to two ferromagnetic leads with noncolicear magnetizations. It is found that the runneling current and the tunnel magnetic resistance can be fully controlled by adjusting the magnetization angle between the two leads. The angle also has significant impact on the spin accumulation on the two dots. The current and the tunnel magnetic resistance sensitively depend on the structure parameters, such as interdot coupling, coupling between the dots and the leads, and thus providing rich controlling methods. The system in the present paper can be used as spin valve and has real usage in spintronics.

关 键 词：非共线性 量子点 铁磁引线 

分 类 号：O469[理学—凝聚态物理]