Abstract
AbstractAn attempt is made to provide a theoretical approach to experimental studies of the acoustoelectric amplification in magnetised piezoelectric semiconductors showing that the attenuation of an acoustic wave crosses over to its amplification when the electron drift velocity exceeds the acoustic wave velocity. First a phenomenological theory is developed to study the relative change in electron effective mass and collision frequency when an acoustic wave passes through piezoelectric semiconductors. Then, analytically, it is shown that this nonlinearity due to the electric vector of the field associated with the wave can also explain this behaviour. Numerical computations are made for n‐InSb at 78 K. It is found that the magnetic field does not have any remarkable effect on amplification.
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