Diffusion-to-streaming transition of transport electrons in polar semiconductors

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Abstract
A Monte Carlo simulation of the motion of transport electrons in a polar semiconductor is performed. The electrons are subjected to an electric field; they are in a parabolic band and undergo scattering with optical phonons. For small electric fields the electrons diffuse, while for strong electric fields they perform a streaming motion. A model is introduced which describes this diffusion to streaming transition. Although the model is simple, it leads to good agreement with the Monte Carlo results.