论文标题
高分辨率光电流光谱法中中性和带电激素的电子和孔G张量
Electron and hole g tensors of neutral and charged excitons in single quantum dots by high-resolution photocurrent spectroscopy
论文作者
论文摘要
我们报告了嵌入具有施加矢量磁场的N-i-Schottky设备中的单个自组装INAS/GAAS量子点（QD）的高分辨率光电流（PC）光谱。带正电荷的激子（x $^+$）和中性激子（x $^0 $）的PC光谱是通过两色谐振激发获得的。在VOIGT几何形状中，X $^+$的双$λ$能级结构和x $^0 $的暗状态的双$λ$能量水平结构清楚地在PC Spectra中观察到了双$λ$的能量水平结构。在Faraday几何形状中，X $^+$的PC幅度随着磁场的增加而减小，然后淬火，这提供了一种新的方法来确定电子和孔G因子的相对符号。使用施加的向量磁场，获得了X $^+$和X $^0 $的电子和孔G因子张量。 x $^+$和x $^0 $的孔G因子的各向异性大于电子的孔。
We report a high-resolution photocurrent (PC) spectroscopy of a single self-assembled InAs/GaAs quantum dot (QD) embedded in an n-i-Schottky device with an applied vector magnetic field. The PC spectra of positively charged exciton (X$^+$) and neutral exciton (X$^0$) are obtained by two-color resonant excitation. With an applied magnetic field in Voigt geometry, the double $Λ$ energy level structure of X$^+$ and the dark states of X$^0$ are observed in PC spectra clearly. In Faraday geometry, the PC amplitude of X$^+$ decreases and then quenches with the increasing of the magnetic field, which provides a new way to determine the relative sign of the electron and the hole g-factors. With an applied vector magnetic field, the electron and the hole g-factor tensors of X$^+$ and X$^0$ are obtained. The anisotropy of the hole g-factors of both X$^+$ and X$^0$ is larger than that of the electron.
