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太赫兹场作用下半导体超晶格的动力学过程及光吸收谱研究

, PP. 482-488

Keywords: 光电子学,光吸收谱,密度矩阵理论,半导体超晶格,太赫兹电磁波

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Abstract:

基于激子基,采用密度矩阵理论研究了太赫兹场作用下半导体超晶格的子带间动力学过程及光吸收谱。在太赫兹场的驱动下,激子作布洛赫振荡。子带间极化的缓慢变化依赖于太赫兹频率,随着太赫兹频率的增加,子带间极化向下振荡,极化强度降低。以和两种超晶格为例进行研究,它们的光吸收谱出现了卫星峰结构,这是由于太赫兹场与万尼尔斯塔克阶梯激子作用的非线性效应产生的。但是就与超晶格相比而言,我们研究发现,n0的激子态光吸收谱中出现的边带效应不是很明显。

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