Dispersion of Volume Relativistic Magnetoplasma Excitation in a Gated Two-Dimensional Electron System

TL;DR

This paper investigates the dispersion characteristics of relativistic magnetoplasma modes in a gated 2D electron system, revealing unique zigzag magnetodispersion and hybridization with photon modes influenced by electron density and geometry.

Contribution

It provides the first detailed measurement of relativistic magnetoplasma dispersion in a gated 2D system, highlighting unusual zigzag behavior and photon hybridization effects.

Findings

Relativistic mode exhibits zigzag-shaped magnetodispersion.

Strong hybridization with photon modes due to electromagnetic field delocalization.

Electron density and structure geometry significantly affect excitation spectrum.

Abstract

The dispersion of the volume relativistic magnetoplasma mode in a gated GaAs/AlGaAs quantum well is measured using a coupled resonators detection technique. The weakly damped relativistic mode exhibits an unusual zigzag-shaped magnetodispersion dependence dictated by the diagonal component of the resistivity tensor $\rho_{xx}$. The plasma excitation easily hybridizes with photon modes due to a large spatial delocalization of its electromagnetic field. The effects of electron density and structure geometry on the excitation spectrum have been investigated.