On the low frequency electromagnetic waves in quasi-two-dimensional metals

Here, we theoretically analyze the spectra of weakly attenuated electromagnetic waves which may appear in a Fermi liquid of charge carriers in quasi-two-dimensional (Q2D) layered conductors when an external magnetic field is applied perpendicularly to the conducting layers. We study transverse modes propagating along the magnetic field. The frequencies of the modes are assumed to be lower than the cyclotron frequency of the charge carriers. It is shown that the Fermi-liquid interaction of the charge carriers in Q2D conductors gives rise to a mode which cannot appear in a gas of charged quasi-particles, as happens in conventional metals. Also, we show that the Fermi-surface profile may cause significant changes in the wave spectra and we analyze these changes.