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arXiv 1010.2276cond-mat.mtrl-sci
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InAs/InP自组装量子点光学性质的原子赝势计算

Atomistic pseudopotential calculations of the optical properties of InAs/InP self-assembled quantum dots

Ming Gong, Weiwei Zhang, Zhuming Han, G. -C. Guo, Lixin He

摘要:

采用经验赝势方法和多粒子效应的组态相互作用处理,对InAs/InP自组装量子点的光学性质进行了全面的研究.并与InAs/GaAs量子点的结果进行了比较。主要结果如下:(i)InAs/InP量子点中中性激子、带电激子和双激子的发射谱线排列与InAs/GaAs量子点中的有很大不同。(ii)InAs/InP量子点中的隐藏相关性为0.7 - 0.9 meV,小于InAs/GaAs量子点中的隐藏相关性。(iii)InAs/InP量子点中的中性激子、带电激子和双激子的辐射寿命比InAs/GaAs量子点中的长一倍左右。(v)InAs/InP量子点的电子和空穴相图与InAs/GaAs量子点的电子和空穴相图有很大的不同。电子和空穴的填充顺序服从Hund规则和Aufbau原理,因此高电荷激子的光致发光光谱与InAs/GaAs量子点的光致发光光谱有很大的不同。

英文摘要:

We present a comprehensive study of the optical properties of InAs/InP self-assembled quantum dots (QDs) using an empirical pseudopotential method and configuration interaction treatment of the many-particle effects. The results are compared to those of InAs/GaAs QDs. The main results are: (i) The alignment of emission lines of neutral exciton, charged exciton and biexciton in InAs/InP QDs is quite different from that in InAs/GaAs QDs. (ii) The hidden correlation in InAs/InP QDs is 0.7 - 0.9 meV, smaller than that in InAs/GaAs QDs. (iii) The radiative lifetimes of neutral exciton, charged exciton and biexciton in InAs/InP QDs are about twice longer than those in InAs/GaAs QDs. (v) The phase diagrams of few electrons and holes in InAs/InP QDs differ greatly from those in InAs/GaAs QDs. The filling orders of electrons and holes are shown to obey the Hund's rule and Aufbau principle, and therefore the photoluminescence spectra of highly charged excitons are very different from those of InAs/GaAs QDs.

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