Electromagnetic quantum waves and their effect on the low temperature magnetoacoustic response of a quasi-two-dimensional metal

TL;DR

This paper theoretically investigates electromagnetic quantum waves in quasi-two-dimensional metals under high magnetic fields, revealing their propagation conditions and significant effects on low-temperature magnetoacoustic responses.

Contribution

It introduces the analysis of electromagnetic quantum waves in Q2D metals and their interaction with sound waves, highlighting their impact on magnetoacoustic behavior.

Findings

Longitudinal collective modes can propagate along magnetic fields in Q2D metals with moderate Fermi surface corrugation.

Wave speeds depend strongly on magnetic field strength.

Interactions between quantum waves and sound waves significantly alter magnetoacoustic responses.

Abstract

We theoretically analyze weakly attenuated electromagnetic waves in quasi-two-dimensional (Q2D) metals in high magnetic fields. Within the chosen geometry, the magnetic field is directed perpendicularly to the conducting layers of a Q2D conductor. We showed that longitudinal collective modes could propagate along the magnetic field provided that the Fermi surface is moderately corrugated. The considered waves speeds strongly depend on the magnetic field magnitude. Also, we analyzed interactions of these quantum waves with sound waves of fitting polarization and propagation direction, and we showed that such interaction may bring significant changes to the low temperature magnetoacoustic response of Q2D conductors.