Nonreciprocal Weyl semimetal waveguide

TL;DR

This paper investigates a cylindrical waveguide made of magnetic Weyl semimetal, revealing how its unique topological properties induce nonreciprocal surface plasmon polariton dispersion and control of propagation direction.

Contribution

It provides a detailed analysis of the dispersion relations in a Weyl semimetal waveguide, highlighting the effects of topological band structure on plasmonic behavior and nonreciprocity.

Findings

Asymmetric dispersion curves due to Weyl semimetal properties

Giant splitting in group velocity controlled by orbital angular momentum

Dispersion depends on plasma frequency, radius, and node separation

Abstract

We study a cylindrical plasmonic waveguide consisting of a magnetic Weyl semimetal embedded in a dielectric medium. We determine the dispersion relation of the surface plasmon polaritons and show how it depends on the plasma frequency, the radius of the semimetal and the separation between the nodes. We show that the band structure, which modifies the electrodynamics in the medium, manifests itself through a pronounced asymmetry in the dispersion curves and a giant splitting in the group velocity, with the orbital angular momentum as a control parameter for the direction of propagation.