Plasmons in a Planar Graphene Superlattice

TL;DR

This paper investigates plasmon excitations in a planar graphene superlattice with alternating gapless and gapped regions, analyzing their dispersion and electromagnetic absorption properties.

Contribution

It provides a theoretical analysis of plasmon dispersion laws and electromagnetic absorption in a novel graphene superlattice structure.

Findings

Derived plasmon dispersion laws for quasi-1D and quasi-2D cases.

Analyzed electromagnetic absorption related to plasmon excitation.

Identified conditions for plasmon excitation in the superlattice.

Abstract

Plasmon collective excitations are studied in a planar graphene superlattice formed by periodically alternating regions of gapless graphene and of its gapped modification. The plasmon dispersion law is determined both for the quasi-one-dimensional case (the Fermi level is located within the minigap) and for the quasi-two-dimensional case (the Fermi level is located within the miniband). The problem concerning the absorption of modulated electromagnetic radiation at the excitation of plasmons is also considered.