Electron-hole recombination density matrices obtained from large configuration-interaction expansions
Electron-hole recombination density matrices obtained from large configuration-interaction expansions
复制标题
从大构型相互作用展开获得的电子空穴复合密度矩阵
DOI：
10.1103/physrevb.67.085314
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发表时间：
2003
影响因子：
3.7
通讯作者：
D. Sundholm
中科院分区：
文献类型：
--
作者：
S. Corni;M. Braskén;M. Lindberg;J. Olsen;D. Sundholm
本文提出了一种由大组态相互作用展开式构造电子-空穴复合密度矩阵等一般跃迁密度矩阵的有效计算方法。本文提出的基于弦的Slater行列式方法是完全通用的，可以用来描述一个或多个电子空穴对的同时湮灭或产生。该方法也可以应用于电子-空穴湮灭过程中涉及剩余粒子的激发。在这项工作中，该方法已实施，并用于获得电子和空穴的辐射复合率限制在半导体In x Ga 1 - x As/GaAs量子点样品。实验单点光致发光（PL）光谱的定性特征很好地解释了计算的PL光谱，包括激子，双激子，和三激子跃迁。所得到的激子-双激子和双激子-三激子分裂与实验符合得很好。目前的计算方法提供了准确和可靠的量子点的PL光谱的解释。
An efficient computational method for constructing general transition density matrices such as the electron-hole recombination density matrix from large configuration interaction expansions is presented. The present string-based Slater-determinant approach is completely general and can be used to describe simultaneous annihilation or creation of one or several electron-hole pairs. The method can also be applied on electron-hole annihilation processes involving excitations of remaining particles. In this work, the method has been implemented and used for obtaining the radiative recombination rates of electrons and holes confined in a semiconductor In x Ga 1 - x As/GaAs quantum dot sample. The qualitative features of an experimental single-dot photoluminescence (PL) spectrum are well explained by the calculated PL spectra including exciton, biexciton, and triexciton transitions. The obtained exciton-biexciton and biexciton-triexciton splittings agree well with the experiment. The present computational approach provides accurate and reliable interpretations of PL spectra for quantum dots.