摘要
从理论上研究了平行双量子点系统的磁输运性质.基于广义主方程方法,计算了通过此系统的电流、微分电导和隧穿磁阻,计算结果表明:电子自旋关联效应可以促发一个很大的隧穿磁阻,而电子库伦关联效应可以导致负隧穿磁阻和负微分电导的出现,对相关的基本物理问题进行了讨论.
We theoretically investigate the magnetotransport through a parallel double quantum dot system coupled to ferromagnetic leads.With the framework of the generalized master equation,we analyze the current,differential conductance and tunnel magnetoresistance as a function of bias for different electronic correlations.The calculated results reveal that spin correlations can induce a giant tunnel magnetoresistance,while Coulomb correlations can cause the occurrence of negative tunnel magetoresistance and negative differential conductance.The relevant underlying physics of this problem is discussed.
出处
《四川师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第6期842-847,共6页
Journal of Sichuan Normal University（Natural Science）
基金
四川省教育厅自然科学重点基金(12ZA132)
四川高校科研创新团队建设计划基金(12TD008)资助项目
关键词
平行双量子点
电子关联
主方程方法
负微分电导
负磁阻
parallel double quantum dot
electronic correlations
master equation method
negative differential conductance
negative tunnel magetoresistance
