CdSe量子点的光学Stark计量：量子点尺寸依赖振子强度的理论计算
Optical Stark metrology of CdSe quantum dots: Reconciling the size-dependent oscillator strength with theory
摘要：
$k\cdot p$有效质量近似（EMA）预测大的，几乎与尺寸无关的激子振子强度在量子限制半导体。然而，实验报告已经得出结论，在强限制的CdSe NQD中的最低能量（1S $_{3/2}$ 1S $_{\text{e}}$）激子的总振子强度是小的并且强烈地依赖于尺寸。利用光学Stark效应，我们证明了CdSe NQD中1S $_{3/2}$ 1S $_{\text{e}}$激子吸收峰的振子强度符合EMA的预测.这些振子强度使得对应于超过100 T的飞秒伪磁场的螺旋选择性不饱和斯塔克位移成为可能。
英文摘要：
The $k\cdot p$ effective mass approximation (EMA) predicts large, nearly size-independent exciton oscillator strengths in quantum confined semiconductors. Yet, experimental reports have concluded that the total oscillator strength of the lowest-energy (1S$_{3/2}$1S$_{\text{e}}$) excitons in strongly confined CdSe NQDs is small and strongly size-dependent. Using the optical Stark effect, we show that the oscillator strength of the 1S$_{3/2}$1S$_{\text{e}}$ excitonic absorption peak in CdSe NQDs follows the predictions of the EMA. These oscillator strengths enable helicity-selective unsaturated Stark shifts corresponding to femtosecond pseudo-magnetic fields exceeding 100 T.
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