自组装InAs/GaAs量子点的应变调谐激发耦合理论
Theory of strain tunning exction coupling in self-assembled InAs/GaAs quantum dots
摘要：
利用Bir-Pikus模型，解析地推导了InAs/GaAs自组装量子点中激子精细结构分裂（FSS）在外加应力作用下的变化.我们发现，FSS的变化主要是由于应变引起的价带混合和价导带耦合。应变下激子的极化角由电子-空穴非对角交换积分的幅角决定。该理论与赝势的经验计算符合得很好。
英文摘要：
We derive analytically the change of exciton fine structure splitting (FSS) under the external stresses in the self-assembled InAs/GaAs quantum dots using the Bir-Pikus model. We find that the FSS change is mainly due to the strain induced valence bands mixing and valence-conduction band coupling. The exciton polarization angle under strain are determined by the argument of the electron-hole off-diagonal exchange integrals. The theory agrees well with the empirical pseudopotential calculations.
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