Nonlinear Response of a Superlattice
DARMSTADT UNIV OF TECHNOLOGY (GERMANY) INST OF MICROWAVE TECHNOLOGY
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In this work we study the nonlinear dc and ac response of a superlattice. We develop asymptotic theories for the I-V curve and ac gain valid in both the very low frequency quasistatic limit, the intermediate frequency limit and high frequency limit. We also explore the I-V curve and ac gain for a quite extensive parameter regime. Parameter regimes which have gain and positive differential conductivity are identified for sufficiently high ac amplitudes. These parameter regimes will be important to understand the nonlinear state of solid state sources in the THz range.