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INTERACTION OF ACOUSTIC WAVES AND ELECTRIC CURRENTS IN SOLIDS,
MICRO STATE ELECTRONICS CORP MURRAY HILL N J
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On the basis of Boltzmanns transport equation an expression is derived for the space-charge modulation in a current-carrying solid when a periodically varying force is acting on the electrons. The force may be caused by an acoustic wave interacting with the electrons through the deformation potential or through the piezoelectric effect. These two special cases are discussed and the condition for obtain ing amplification of the acoustic wave is derived. The high-frequency properties of the two interaction machanisms are studied. In an appendix it is shown that the deformation potential mechanism may be descrribed by two linear equations similar to the well-known piezoelectric equations. Author
APPROVED FOR PUBLIC RELEASE