Localized magnetoplasmon modes arising from broken translational symmetry in semiconductor superlattices

TL;DR

This paper analytically investigates localized magnetoplasmon modes in semiconductor superlattices with broken translational symmetry, revealing conditions for low-frequency and high-frequency localized excitations.

Contribution

It provides an analytical calculation of localized magnetoplasmon modes in superlattices with broken symmetry, detailing their properties in different spectral regimes.

Findings

Low frequency retarded modes occur with reduced surface carrier density.

A doublet of high-frequency localized modes appears otherwise.

Properties are discussed in both radiative and non-radiative regimes.

Abstract

The electromagnetic propagator associated with the localized collective magnetoplasmon excitations in a semiconductor superlattice with broken translational symmetry, is calculated analytically within linear response theory. We discuss the properties of these collective excitations in both radiative and non-radiative regimes of the electromagnetic spectra. We find that low frequency retarded modes arise when the surface density of carriers at the symmetry breaking layer is lower than the density at the remaining layers. Otherwise a doublet of localized, high-frequency magnetoplasmon-like modes occurs.