Edge plasmon polaritons on a half-plane

TL;DR

This paper investigates how electromagnetic retardation influences edge plasmon polaritons in a semi-infinite 2D electron system, revealing high Q-factor resonances across a broad frequency range.

Contribution

It provides a theoretical analysis of edge plasmon polaritons considering electromagnetic retardation effects, with solutions to integral equations and insights into their spatial distribution.

Findings

Edge plasmon polaritons exhibit high Q factors at all frequencies.

Retardation effects significantly influence the spectrum of edge plasmons.

The spatial distribution of potentials, charges, and currents is characterized.

Abstract

The effect of electromagnetic retardation on the spectrum of edge plasmons in a semi-infinite two-dimensional electron system is considered. The problem is reduced to complicated integral equations for the potentials, which are solved upon a major simplification of the kernel. The spatial distribution of the potentials, charges, and currents is analyzed. It is shown that edge plasmon polaritons in the high-conductivity two dimensional system are characterized by a high Q factor at all frequencies, including those lower than the inverse electron relaxation time.