嵌入平行量子点的非平衡介观环路的极化电流

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.关键词：极化电流耦合量子点Kondo效应温度效应

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

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.