Electromagnetic excitation of sound in a plate of compensated metal

The theory of electromagnetic excitation of sound is developed for the case of a plate of compensated metal in a strong magnetic field perpendicular to the surface. It is shown that the nature of the surface reflection of electrons has a strong influence on the coefficient for the transformation of electromagnetic waves into acoustic ones, which is much larger for diffuse scattering of electrons than for specular reflection. Another consequence of diffuse scattering is a modulation of the amplitude of the transformed acoustic wave by dimensional electron phenomena, the Sondheimer effect and the excitation of a slightly damped standing electromagnetic wave of a doppleron. The variation in the amplitude of the acoustic signal transmitted through the plate is studied in the vicinity of the doppleron–phonon and doppleron–shear acoustic cyclotron resonance as a function of the conditions for the formation of a standing acoustic wave and a numerical calculation is performed to obtain the line shape for the transmitted signal in a situation close to the real experimental one both for excitation by sound and for excitation by an electromagnetic wave.

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