A nonlinear theory is developed for electronic conduction in the presence of acoustic energy in piezoelectric semiconductors. The theory is valid for the cases of large acoustic energy and large electric field. The resulting expression is of closed form. The conductivities of acoustoelectric domains are measured. The experimental results are consistent with the theory if the domains are assumed to be composed of more than one acoustic frequency.
Bursts of electroluminescence were produced when a 50–500-ns excess voltage pulse was superimposed on the ``drive'' voltage which produced an acoustoelectric domain. The intensity of the luminescence was found to increase with the amplitude of the excess voltage and first increase then decrease as a function of the drive voltage. Self-illuminated photographs of the domains showed them to be ≈0.4 mm wide.
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