Effect of Longitudinal Magnetic Field on Acoustoelectric Amplification in n-InSb

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Abstract
Appreciable enhancement of the acoustoelectric gain by longitudinal magnetic fields is observed in the classical regime (ℏωc). The enhancement increases monotonically with magnetic field, reaching saturation at fields corresponding to ωcτ being equal to a few units. The dependence of the magnetoacoustic enhancement on carrier concentration is analogous to that of the longitudinal magnetoresistance, both are more pronounced the lower the carrier concentration. The observed effect of the longitudinal magnetic field on the acoustic gain is similar to that reported for the acoustic attenuation in the quantum limit (ℏωc≫kT), but for the regime studied (ℏωc) no theory has as yet been developed.