Terahertz Magnetoplasmon Energy Concentration and Splitting in Graphene PN Junctions

TL;DR

This paper investigates how terahertz magnetoplasmons in graphene p-n junctions can be concentrated or split by magnetic fields, enabling potential applications like plasmonic isolators.

Contribution

It reveals the non-reciprocal behavior of magnetoplasmons in doped graphene p-n junctions under magnetic fields, highlighting a novel energy concentration and splitting mechanism.

Findings

Magnetoplasmons are concentrated at the junction center in one direction.

Magnetoplasmons split away from the junction center in the opposite direction.

External magnetic fields induce non-reciprocal plasmonic modes.

Abstract

Terahertz plasmons and magnetoplasmons propagating along electrically and chemically doped graphene p-n junctions are investigated. It is shown that such junctions support non-reciprocal magnetoplasmonic modes which get concentrated at the middle of the junction in one direction and split away from the middle of the junction in the other direction under the application of an external static magnetic field. This phenomenon follows from the combined effects of circular birefringence and carrier density non-uniformity. It can be exploited for the realization of plasmonic isolators.