Plasmon damping rates in Coulomb-coupled two-dimensional layers in a heterostructure

TL;DR

This paper investigates how Coulomb interactions affect plasmon frequencies and damping rates in a heterostructure composed of silicene and graphene layers, revealing how layer separation influences these properties.

Contribution

It introduces a novel calculation of plasmon damping rates in Coulomb-coupled 2D heterostructures, highlighting the impact of interlayer separation on plasmon behavior.

Findings

Coulomb coupling renormalizes plasmon frequencies.

Damping rates depend on interlayer separation.

Surface response functions elucidate plasmon dispersion.

Abstract

The Coulomb excitations of charge density oscillation are calculated for a double-layer heterostructure. Specifically, we consider two-dimensional (2D) layers of silicene and graphene on a substrate. From the obtained surface response function, we calculated the plasmon dispersion relations which demonstrate the way in which the Coulomb coupling renormalizes the plasmon frequencies. Additionally, we present a novel result for the damping rates of the plasmons in this Coulomb coupled heterostructure and compare these results as the separation between layers is varied.