SOUND WAVE AMPLIFICATION IN INDIUM ANTIMONIDE

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Abstract
We have directly measured acoustic wave amplification of shear waves in high mobility InSb in the frequency range 0.5–2.0 GHz. At 1 GHz we have observed 10 dB net terminal gain. We find good agreement with the modified theory of White in the high magnetic field region where the acoustic wavelength λ is much larger than the Larmor radius of the electrons. In the low magnetic field limit it is necessary to use the Boltzmann transport equation approach of Spector; in this case, good agreement with the observed behavior is obtained. This effect is shown to be responsible for the two‐mode threshold behavior for acoustoelectric domain oscillations in InSb.