This paper compares and contrasts different theoretical approaches based on incoherent electron scattering transport with experimental measurements of optoelectronic devices formed from semiconductor heterostructures. The Monte Carlo method which makes no a priori assumptions about the carrier distribution in momentum or phase space is compared with less computationally demanding energy-balance rate equation models which assume thermalised carrier distributions. It is shown that the two approaches produce qualitatively similar results for hole transport in p-type Si1-xGex/Si superlattices designed for terahertz emission. The good agreement of the predictions of rate equation calculations with experimental measurements of mid- and far-infrared quantum cascade lasers, quantum well infrared photodetectors and quantum dot infrared photodetectors substantiate the assumption of incoherent scattering dominating the transport in these quantum well based devices. However, the paper goes on to consider the possibility of coherent transport through the density matrix method and suggests an experiment that could allow coherent and incoherent transport to be distinguished from each other. ud
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机译:本文将基于非相干电子散射传输的不同理论方法与由半导体异质结构形成的光电器件的实验测量结果进行了比较和对比。将没有对动量或相空间中的载流子分布进行先验假设的蒙特卡罗方法与假设载热的载流子分布的计算量较小的能量平衡速率方程模型进行了比较。结果表明,两种方法在为太赫兹发射设计的p型Si1-xGex / Si超晶格中对于空穴传输产生了定性相似的结果。速率方程计算的预测与中红外和远红外量子级联激光器,量子阱红外光电探测器和量子点红外光电探测器的实验测量值很好地吻合,证明了在这些基于量子阱的器件中,非相干散射主导着传输。但是,本文继续考虑了通过密度矩阵法进行相干传输的可能性,并提出了一个可以将相干传输和非相干传输区分开的实验。 ud
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