自旋极化对量子点系统电导的影响

Effect of Spin Polarization on the Conductance of the Quantum Dot System

从自旋非简并Anderson模型出发,研究局域电子自旋能级分裂对系统电导的影响。由于局域电子自旋极化会破坏近藤类型的电子强关联,在非关联近似下,通过求解量子点的Green函数并以自旋能级劈裂为小参数将Green函数展开,利用Landauer公式推导出电导变化与局域自旋能级劈裂的关系。

By using non-degenerate Anderson model, the influence of local spin polarization on the conductance of quantum dot system was study. Based on the truncate approximation and non-condenced condition, the equation of motion gave the approximate solution of Green＇s functions. Then the power siries expansion of the Green＇s functions with respect to the splitting of local spin energy was got. Finally, local level splitting dependence of conductance from Landauer formula was obtained.