Weyl magnetoplasma waves in magnetic Weyl semimetals

TL;DR

This paper introduces a new theoretical framework showing that magnetic Weyl semimetals can host Weyl magnetoplasma waves at zero magnetic field, enabling nonreciprocal energy flow and topologically protected modes in the THz range.

Contribution

The authors develop an effective Hamiltonian for magnetic Weyl semimetals, revealing their ability to support Weyl magnetoplasma physics without external magnetic fields.

Findings

Weyl magnetoplasma waves can exist at zero magnetic field in magnetic Weyl semimetals.

Topologically protected nonreciprocal modes are localized at magnetic domain walls.

These effects are observable in the broad THz frequency window.

Abstract

Weyl degeneracies in spectra of magnetoplasma waves enable nonreciprocal energy flow and topologically protected modes, yet conventional materials require impractical magnetic fields to operate. Developing an effective Hamiltonian framework for magnetic Weyl semimetals, we show that these systems overcome the limit, hosting Weyl magnetoplasma physics at zero field due to their giant intrinsic anomalous Hall response. The resulting topology supports nonreciprocal modes localized at magnetic domain walls, including a pair of topological "Fermi-arc-like modes and additional bound states. These effects are fully developed across a broad THz window, and we propose feasible experimental routes for their detection.