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基于分立漂移模型研究了磁场对载流子在弱耦合GaAs/AlAs超晶格中的动力学行为的影响。研究表明磁场较小时超晶格中载流子的集聚形成电场畴,该电场畴的周期移动引起电流振荡的产生,随着磁场的增加系统中形成的电场畴变得稳定,电流振荡也逐渐消失。因此,磁场控制下系统的状态可以从动态转变到稳定态。受交流电场驱动时,由于内部电流振荡信号和外部交流信号的耦合,载流子运动展现出很多的非线性行为。
The effect of magnetic field on the dynamic behavior of charge carriers in weakly coupled GaAs / AlAs superlattices was studied based on the discrete drift model. The results show that when the magnetic field is small, the charge carriers in the superlattice form an electric field, and the periodic movement of the electric field causes the current oscillation. With the increase of the magnetic field, the electric field formed in the system becomes stable and the current oscillation disappears gradually . Therefore, the state of the system under magnetic field control can change from a dynamic state to a steady state. When driven by AC electric field, carrier mobility shows a lot of nonlinear behavior due to the coupling of internal current oscillation signal and external AC signal.