Magnetoplasmons in layered graphene structures

TL;DR

This paper investigates magnetoplasmon behavior in layered graphene structures under magnetic fields, revealing potential for terahertz radiation generation through instability enhancement in superlattices.

Contribution

It introduces calculations of magnetoplasmon dispersion in various layered graphene systems and demonstrates enhanced instability in superlattices for THz applications.

Findings

Magnetoplasmon instabilities can be induced by drift in layered graphene.

Superlattice structures show stronger instability than single layers.

Unstable magnetoplasmons have energies in the terahertz range.

Abstract

We calculate the dispersion equations for magnetoplasmons in a single layer, a pair of parallel layers, a graphite bilayer and a superlattice of graphene layers in a perpendicular magnetic field. We demonstrate the feasibility of a drift-induced instability of magnetoplasmons. The magnetoplasmon instability in a superlattice is enhanced compared to a single graphene layer. The energies of the unstable magnetoplasmons could be in the terahertz (THz) part of the electromagnetic spectrum. The enhanced instability makes superlattice graphene a potential source of THz radiation.