# Optical properties and electromagnetic modes of Weyl semimetals

## TL;DR

This paper provides a comprehensive theoretical analysis of electromagnetic modes in Weyl semimetals, revealing how their unique electronic structures influence optical responses and can be probed through various electromagnetic measurements.

## Contribution

It introduces detailed conductivity tensors for bulk and surface states, enabling extraction of Weyl semimetal electronic properties from optical experiments.

## Key findings

- Derived conductivity tensors for bulk and surface states.
- Demonstrated how optical measurements reveal Weyl node positions and separations.
- Showed the influence of Fermi energy and Fermi arcs on electromagnetic modes.

## Abstract

We present systematic theoretical studies of both bulk and surface electromagnetic eigenmodes, or polaritons, in Weyl semimetals. We derive the tensors of bulk and surface conductivity taking into account all possible combinations of the optical transitions involving bulk and surface electron states. We show how information about electronic structure of Weyl semimetals, such as position and separation of Weyl nodes, Fermi energy, and Fermi arc surface states, can be unambiguously extracted from measurements of the dispersion, transmission, reflection, and polarization of electromagnetic waves.