嵌入平行量子点的非平衡介观环路的极化电流  

Magnetic polarization currents in parallel-coupled double-quantum-dot devices

作　　者：谌雄文[1] 贺达江[1] 吴绍全[2] 宋克慧[1] 

机构地区：[1]怀化学院物理与电子信息科学系 [2]四川师范大学物理系,成都610068

出　　处：《物理学报》2006年第8期4287-4291,共5页Acta Physica Sinica

基　　金：四川省应用基础研究基金(批准号:02GY029188);四川省教育厅自然科学基金(批准号:2003A078)资助的课题.~~

摘　　要：利用格林函数并借助于双杂质Anderson模型的哈密顿量,研究了嵌入平行耦合量子点的非平衡介观环路的磁极化电流性质.结果表明:在零温环境中,随着双量子点耦合强度的增加,系统的Kondo效应被削弱.在低温环境中,人为控制和调节一定的电路参数,极化电流会发生方向的反转,从而可实现对介观环路的极化.We theoretically study the properties of the magnetic polarization currents （MPC） in parallel-coupled double-quantum-dot devices by means of the two-impurity Anderson Hamiltonian and Green functions. It is shown that at zero temperature, the Kondo effect of the system becomes weaker with the increase of the coupling strength. At low temperature, by varying some conditions such as temperature and bias voltage, the direction and magnitude of MPC can be changed, which implies that the magnetic states of the device can be mode up-, non- or down-polarized.

关 键 词：极化电流 耦合量子点 KONDO效应 温度效应 

分 类 号：O413[理学—理论物理] TB383[理学—物理]