Excitonic theory of stark ladder spectra in superlattices
Excitonic theory of stark ladder spectra in superlattices
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超晶格中斯塔克梯谱的激子理论
DOI：
10.1051/jp4:1993538
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
D. Whittaker
中科院分区：
文献类型：
--
作者：
D. Whittaker
预测激子的行为在斯塔克阶梯制度是一个有趣的理论问题，需要治疗的强耦合之间的一些激子状态与不同的值的电子-空穴分离。本文介绍了一种新的方法，它允许一个基本上精确的计算斯塔克阶梯光谱，与可忽略不计的增宽，在很宽的领域。从激子绿色的功能，这是使用一组耦合的微分方程的数值解对应于孤立层上的二维面内运动的振子强度进行评估。当适当加宽时，光谱真实地再现了实验获得的光谱。在更高的分辨率下，可以看到更多的细节，包括由耦合到连续态引起的激子年的Fano共振线形
Predicting exciton behaviour in the Stark ladder regime is an interesting theoretical problem, requiring the treatment of strong coupling between a number exciton states with different values of the electron-hole separation. In this paper a new method is described which allows an essentially exact calculation of Stark ladder spectra, with negligible broadening, over a wide range of fields. The oscillator strength at each energy is evaluated from an exciton Green's function which is constructed using numerical solutions of the set of coupled differential equations corresponding to the two dimensional in-plane motion on isolated layers. When suitably broadened, the spectra realistically reproduce those obtained experimentally. At higher resolution more details can be seen, including the Fano-resonance lineshapes of the exciton years caused by coupling to continuum states