AC Large Signal Conduction and Harmonic Generation af a GaAs-AlGaAs Superlattice
The prospect of negative differential conductance in Bloch miniband transport predicted by Esaki and Tsu1 brings into focus the need for an analysis of such features under dynamic conditions. In this paper, we discuss the current response of vertical superlattice transport when a strong ac signal of frequency ω is superposed on a strong dc bias field. The nonlinearity involved results in harmonic generation in conjunction with distortion of the periodic current response, and this is analyzed here using a quasi-analytical balance equation approach, which involves only a few percent of the computational effort of an earlier Monte Carlo simulation2. Moreover, our analysis treats random impurity and phonon (acoustic and polar optic) scatterings on a realistic three-dimensional microscopic basis, and is not constrained by the one-dimensional assumptions of other work3.
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