中文摘要：

利用粒子数分辨量子主方程,研究了单量子点与两个铁磁电极耦合系统内有效核磁场对电子全计数统计特性的影响。数值结果表明有效核磁场的大小和方向对平均电流基本上没有影响;但是,仅有单占据与空占据量子点本征态之间的转变参与量子输运时,特别是,当两个铁磁电极自旋极化率较大,并且量子点电极耦合强度大于有效核磁场大小时,有效核磁场的大小和方向对散粒噪声和偏斜度有显著的影响。因此,可以基于量子点的电流高阶累积矩来定性获取其有效核磁场大小和方向的信息。

英文摘要：

The electron counting statistics of electron transport through a single quantum dot（QD）weakly coupled to two ferromagnetic electrodes is studied based on an efficient particle-number-resolved master equation.The results demonstrated that the orientation and magnitude of the effective nuclear magnetic field had no influence on the average current;whereas that had a significant impact on the shot noise and skewness,especially for a relatively large spin polarizations of the two ferromagnetic electrodes and the magnitude of the effective nuclear magnetic field being smaller than the QD-electrode coupling.These characteristics can be used to detect the orientation and magnitude of the effective nuclear magnetic field in the single QD.