2-BAND DENSITY-MATRIX APPROACH TO NONLINEAR OPTICS OF EXCITONS
2-BAND DENSITY-MATRIX APPROACH TO NONLINEAR OPTICS OF EXCITONS
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DOI：
10.1103/physrevb.40.4095
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发表时间：
1989-08-15
影响因子：
3.7
通讯作者：
STAHL, A
中科院分区：
文献类型：
--
作者：
BALSLEV, I;ZIMMERMANN, R;STAHL, A
在实空间表象中建立了半导体在强光场驱动下的双带密度矩阵动力学模型。建立了与相应的k-空间理论的联系。将实空间理论应用于有限宽度量子阱中激子共振的情况。研究了描述动态斯塔克效应的解，特别强调了以下几点：(I)测量信号与探测光束的光谱滤波是在样品之前还是之后的依赖关系；(Ii)短抽运脉冲、抽运脉冲与探测脉冲之间的延迟以及抽运激发的退相的影响。对摄动解析处理和相关运动方程的实时数值积分进行了比较。
The two-band density-matrix dynamics of a semiconductor driven by an intense light field is set up in a real-space representation. The relation to the corresponding k-space theory is established. The real-space theory is applied to the case of excitonic resonances in a quantum well of finite width. Solutions describing the dynamical Stark effect are studied with particular emphasis on the following points:(i) the dependence of the measured signal on whether the spectral filtering of the probe beam is before or after the sample, and (ii) the influence of short pump pulses, the delay between the pump and the probe pulse, and the dephasing of the pump excitation. A perturbative analytical treatment and a real-time numerical integration of the relevant equations of motion are compared.