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

TL;DR

This paper theoretically investigates low-frequency electromagnetic wave spectra in quasi-two-dimensional metals under magnetic fields, revealing Fermi-liquid interactions induce unique modes and surface profile effects significantly alter wave spectra.

Contribution

It introduces the theoretical prediction of a new electromagnetic mode caused by Fermi-liquid interactions in Q2D conductors, and analyzes how Fermi surface profiles influence wave spectra.

Findings

Fermi-liquid interactions produce a unique electromagnetic mode in Q2D metals.

Fermi surface shape significantly affects electromagnetic wave spectra.

The studied modes are weakly attenuated and propagate along magnetic fields.

Abstract

Here, we theoretically analyze 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 Fermi-liquid interaction of the charge carriers in Q2D conductors gives rise to a mode which cannot appear in a gase of charged quasiparticles, as well as it happens in conventional metals. Also, we show that the Fermi surface plofile may cause significant changes in the waves spectra and we analyze these changes.