We model theoretically an unusual ac negative differential mobility (NDM) effect that occurs when electrons are accelerated by an electric field in the highly nonparabolic conduction band of dilute nitride Ga(AsN) alloys. By solving balance equations that take into account the negative effective mass of electrons and the velocity and energy relaxation processes, we derive an expression for the maximum response frequency, fmax, associated with the NDM. Our predicted values of fmax depend on material composition and can be tuned by the applied electric field up to terahertz frequencies.
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Игнатов et al. (2006) studied this question.
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