摘要
通过求解Bogoliubov-deGennes方程,利用推广的Bonder-Tinklam-Klapwijk方法,计算铁磁/绝缘层/铁磁/绝缘层/超导结构中的微分电导(G)和散粒噪声(S)。研究发现系统中的微分电导和散粒噪声都随中间铁磁层厚度作两种不同周斯的振荡,其中通过增强铁磁材料中的交换劈裂和铁磁/超导界面的势垒强度,短周期分量可从长周期中分离出来,反之通过降低铁磁层中的交换劈裂和铁磁/超导界面的势垒强度,长周期分量可从短周期中分离出来,这一结果表明G和S中的两种不同周期的振荡分量分别来自入射电子与铁磁/超导界面处的Andreev反射和正常电子反射的量子干涉效应。
By solving Bogoliubov-de Gennes equations and applying an extend Blonder-Tinklam-Klapwijk approach, we calculate the differential conductance (G) and shot noise (S) in ferromagnet/ insulator/ ferromagnet/ insulator superconductor (FM/I/FM/I/SC) structures. It is found that the G or S exhibit two oscillation components with different periods as intermediate FM length, the short - period component can be separated from the long - period one by increasing the exchange splitting in FM and the barrier strength at FM/SC interface, and vice versa, indicating that the long and short period components arise from quantum interference effects, respectively, due to the Andreev and normal reflections at FM/SC interface.
出处
《低温与超导》
CAS
CSCD
北大核心
2004年第4期43-46,49,共5页
Cryogenics and Superconductivity
基金
国家自然科学基金资助项目(基金号:10347129)
江苏省"333"工程资助项目。
