标题： CdSe量子点的光学斯塔克计量学：协调尺寸依赖的振子强度与理论 显示英文标题

标题： 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）预测在量子受限半导体中激子振子强度较大且几乎与尺寸无关。 然而，实验报告得出结论认为，在强受限的CdSe纳米量子点中，最低能量（1S$_{3/2}$1S$_{\text{e}}$）激子的总振子强度较小且强烈依赖于尺寸。 利用光学斯塔克效应，我们表明CdSe纳米量子点中1S$_{3/2}$1S$_{\text{e}}$激子吸收峰的振子强度符合EMA的预测。 这些振子强度使得自旋选择性非饱和斯塔克位移成为可能，对应的飞秒伪磁场超过100 T。 显示英文摘要

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.