Undamped relativistic magnetoplasmons in lossy two-dimensional electron systems

TL;DR

This paper investigates the electrodynamic behavior of lossy 2D electron systems under magnetic fields, revealing a 'relativistic' phase diagram and predicting undamped magnetoplasmon modes with potential implications for plasmonic applications.

Contribution

It introduces a novel classification of magnetoplasma spectra using a 'relativistic' phase diagram and predicts undamped plasmon modes in lossy 2D electron systems.

Findings

Identification of a 'relativistic' phase diagram for 2D conductivity and magnetic field.

Prediction of an undamped magnetoplasmon branch at specific phases.

Discovery of unique magnetoplasmon features caused by magnetic fields.

Abstract

We address electrodynamic effects in plasma oscillations of a lossy 2D electron system whose dc 2D conductivity is comparable to the speed of light. We argue that the perpendicular constant magnetic field B causes astonishing features of magnetoplasma dynamics. We show that plasmon-polariton spectra can be classified using a 'relativistic' phase diagram 2D conductivity divided by the speed of light versus B. An extraordinarily low damping branch in magnetoplasmon-polariton spectra emerges at two phases of this diagram. Some magnetoplasmons at these phases are predicted to be undamped waves.