Excitation of zeroth sound waves and quasiwaves in metals with a weak Fermi-liquid interaction

Various types of fast waves excited by an acoustic pulse in the Fermi liquid of a metal are considered by using a unified model. The conditions required for the formation of a zeroth sound wave are determined. It is shown, in particular, that, in the case of a weak Fermi-liquid interaction, zeroth sound is formed at a distance from the metal surface that is much larger than its wavelength. Besides, it is shown that a ballistic quasiwave existing in the model of Fermi gas is considerably affected by the Fermi-liquid interaction. For ωτ≪l, the quasiwave competes with a wave of nonequilibrium concentration of charge carriers of various types.

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