耦合于铁磁电极平行双量子点的自旋极化输运  

Spin-Polarized Transport of Parallel Double Quantum Dots Coupled to Ferromagnetic Electrodes

作　　者：侯涛[1] 吴绍全[1] 毕爱华[1] 

机构地区：[1]四川师范大学物理与电子工程学院

出　　处：《四川师范大学学报（自然科学版）》2009年第2期210-214,共5页Journal of Sichuan Normal University（Natural Science）

基　　金：四川省应用基础研究基金(2006J13-155);四川省教育厅自然科学重点基金(2006A069)资助项目

摘　　要：利用双杂质的Anderson模型的哈密顿量,从理论上研究了耦合于铁磁电极的平行双量子点的自旋极化输运性质,并借助运动方程方法求解了哈密顿量.结果表明,该系统在费米能级处的Kondo共振峰与自旋极化强度和磁通量的取值有关.与此同时,在平行组态情况下,Kondo共振峰位置发生了偏移,而在反平行组态情况下,Kondo共振峰出现在相同位置处.这些现象使得这一双量子点系统的物理特性更加丰富,它们将有助于解释自旋电子学中的电子关联问题.By means of the two-impurity Anderson Hamihonian, this paper theoretically investigates the properties of spin-polarized transport of the parallel double quantum dots coupled with two ferromagnetic electrodes. The Hamihonian is solved by means of the method of motion equation. It is showed that the Kondo resonance peak of this system at the Fermi energy position is relevant to the value of the spin-polarized strength and the magnetic flux. Moreover, in the parallel configuration, the position of the Kondo peak will shift, while it remains unchanged for the antiparallel configuration. These phenomena make the physical behavior of this system much richer and these effects might be helpful in explaining the problems of electronic correlation in spin electronics.

关 键 词：双量子点 Kondo共振 透射几率 

分 类 号：O488[理学—固体物理]