Helicon-Phonon Interaction in Metals

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Abstract
The purpose of this paper is twofold. Firstly, we present an analysis of the transverse modes of oscillation of an electron gas in the presence of a strong longitudinal magnetic field. These modes have been called helicons. We exhibit the form of the dispersion equation of helicons of arbitrary wave vector. Secondly, we study the interaction of helicons with transverse acoustic waves in metals. This interaction is particularly strong when the frequencies and wavelengths of a helicon and a transverse phonon coincide. It is suggested that this effect permits the excitation of transverse phonons by electromagnetic means. We also discuss the interaction of helicons and phonons in the long-wavelength limit. In this case we find small corrections to their frequencies.

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