THEORY OF TRANSIENT EXCITONIC OPTICAL NONLINEARITIES IN SEMICONDUCTOR QUANTUM-WELL STRUCTURES
THEORY OF TRANSIENT EXCITONIC OPTICAL NONLINEARITIES IN SEMICONDUCTOR QUANTUM-WELL STRUCTURES
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DOI：
10.1103/physrevb.32.6601
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发表时间：
1985-01-01
影响因子：
3.7
通讯作者：
MILLER, DAB
中科院分区：
文献类型：
--
作者：
SCHMITTRINK, S;CHEMLA, DS;MILLER, DAB
我们提出了激子气体和电子空穴等离子体对二维半导体中激子光学吸收影响的理论结果，并将这些结果与最近关于单量子阱和多量子阱结构中吸收饱和的实验结果进行了比较。本文对这些微结构的非线性光学性质进行了简单的理论描述，其中包括在带边缘附近和以上的低密度光激发情况。我们认为，在这些结构中，等离子体对激子的库仑屏蔽效应相对较弱，但相空间填充和交换的结果在每种情况下都是显著的。我们能够解释最近意想不到的实验结果，即“冷”激子比“热”载流子更有效地饱和激子吸收。在无参数可调的情况下，与实验数据吻合较好。
We present theoretical results for the effects of an exciton gas and an electron-hole plasma on the excitonic optical absorption in a two-dimensional semiconductor and compare these with recent experimental results on absorption saturation in single-and multiple-quantum-well structures. A simple theoretical description of the nonlinear optical properties of these microstructures is developed for the case of low-density optical excitation near and above the band edge. We argue that the effects of Coulomb screening of excitons by the plasma are relatively weak in these structures but that the consequences of phase-space filling and exchange are significant in each case. We are able to explain the recent unexpected experimental result that ‘‘cold’’excitons are more effective than ‘‘hot’’carriers in saturating the excitonic absorption. Good agreement with the experimental data is obtained without adjustable parameters.