Plasmons in layered structures including graphene

TL;DR

This paper analyzes the optical and plasmonic properties of layered structures with graphene interfaces, providing a comprehensive response function including retardation effects and exploring tunable plasmon modes.

Contribution

It derives the full dielectric response of layered graphene structures with arbitrary polarization and temperature, including effects of nonhomogeneous dielectrics and mode tuning.

Findings

Derivation of the full response and dielectric function for layered graphene structures.

Identification of how dielectric backgrounds influence plasmon modes.

Demonstration of tuning plasmon modes into acoustic modes with specific velocities.

Abstract

We investigate the optical properties of layered structures with graphene at the interface for arbitrary linear polarization at finite temperature including full retardation by working in the Weyl gauge. As a special case, we obtain the full response and the related dielectric function of a layered structure with two interfaces. We apply our results to discuss the longitudinal plasmon spectrum of several single and double layer devices such as systems with finite and zero electronic densities. We further show that a nonhomogeneous dielectric background can shift the relative weight of the in-phase and out-of-phase mode and discuss how the plasmonic mode of the upper layer can be tuned into an acoustic mode with specific sound velocity.