# Plasmon-polariton from a helical state in Dirac magnet

## TL;DR

This paper demonstrates the existence of a topologically protected one-dimensional plasmon-polariton in Dirac magnets, with a non-linear dispersion, confined to domain walls, enabling manipulation of quantum optical states via magnetic domain control.

## Contribution

It introduces a novel topological plasmon-polariton in Dirac magnets and derives an exact spectral equation for this excitation.

## Key findings

- Support for a non-linear dispersion of the plasmon-polariton
- Confinement of excitations to magnetic domain walls
- Potential for manipulating quantum optical states

## Abstract

Optical field interacting with a topologically protected one-dimensional helical state is shown to support a one-dimensional plasmon-polariton that is characterized by a non-linear dispersion. In a two-dimensional Dirac magnet these electro-optical excitations are confined to domain walls, thus, offering a possibility to manipulate quantum optical states by altering magnetic domain configurations. An exact spectral equation for such a topological plasmon-polariton is derived.