The experimental success in the generation of coherent ultrasonic waves from a GaAs Gunn oscillator with a dc pulse is reported. The frequency of the ultrasound is independent of the mechanical eigenfrequency of the oscillator.
No takes yet. Share an insight, caveat, or question.
Hayakawa et al. (1969) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: