Helicons in tilted-Weyl semimetals

TL;DR

This paper investigates the existence of helicon modes in tilted Weyl semimetals using a semiclassical Boltzmann approach, extending previous work on isotropic or single Weyl semimetals.

Contribution

It introduces a tilt term into the model to analyze helicon modes in gapless Weyl semimetals, revealing their existence in these materials.

Findings

Helicon modes are present in tilted Weyl semimetals.

Tilt modifies the properties of helicon modes.

The study extends understanding of electromagnetic modes in topological materials.

Abstract

Helicons are transverse electromagnetic modes in three-dimensional (3D) electron systems in the presence of a static magnetic field. These modes have been proposed in isotropic or single Weyl semimetals(WSMs) (Francesco M.D. Pellegrino et al, Phys.\ Rev.\ B {\bf 92}, 201407(R) (2015)). In this work, we introduce a tilt term to investigate helicon modes in gapless WSMs within a semiclassical Boltzmann approach and show that the helicon modes exist in tilted WSMs.