arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.00369cond-mat.mes-hall
收藏

GaAs/AlGaAs量子点中中性和带电激子的磁光性质理论

Theory of magneto-optical properties of neutral and charged excitons in GaAs/AlGaAs quantum dots

Diana Csontosová, Petr Klenovský

摘要:

对弱限制GaAs/AlGaAs量子点的磁光性质进行了详细的理论研究。我们着重于中性和带电激子态的抗磁系数和$g$ -因子,以及它们随沿$[001]$方向施加的磁场的不同点尺寸的演化。对于计算,我们利用组合的${\bf k}\cdot{\bf p}$和组态相互作用方法。我们将理论分解为四个精度水平,即,(i)单粒子电子和空穴态,(ii)非相互作用的电子-空穴对,(iii)由两个准粒子的基态构成并通过库仑相互作用(即具有最小量的相关性)相互作用的电子-空穴对,以及(iv)包括相关性效应的电子-空穴对。上述方法使我们能够确定各种单粒子和多粒子效应对所研究的磁光特性的主要影响,从而可以使用尽可能简单的模型表征实验,但保留详细的物理图像。

英文摘要:

Detailed theoretical study of the magneto-optical properties of weakly confining GaAs/AlGaAs quantum dots is provided. We focus on the diamagnetic coefficient and the $g$-factor of the neutral and the charged excitonic states, respectively, and their evolution with various dot sizes for the magnetic fields applied along $[001]$ direction. For the calculations we utilize the combination of ${\bf k}\cdot{\bf p}$ and the configuration interaction methods. We decompose the theory into four levels of precision,~i.e., (i) single-particle electron and hole states, (ii) non-interacting electron-hole pair, (iii) electron-hole pair constructed from the ground state of both quasiparticles and interacting via the Coulomb interaction (i.e. with minimal amount of correlation), and (iv) that including the effect of correlation. The aforementioned approach allows us to pinpoint the dominant influence of various single- and multi-particle effects on the studied magneto-optical properties, allowing the characterization of experiments using models which are as simple as possible, yet retaining the detailed physical picture.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑