Electronic chiralization as an indicator of the anomalous Hall effect in unconventional magnetic systems

TL;DR

This paper introduces electronic chiralization as a new physical indicator for the anomalous Hall effect in antiferromagnetic metals, especially useful in systems with negligible net magnetization, and demonstrates its relevance through theoretical models.

Contribution

It proposes electronic chiralization as a measurable indicator of the AHE in unconventional magnetic systems, highlighting the role of magnetic charge.

Findings

Electronic chiralization can be measured via scattering experiments.

Magnetic charge significantly influences the AHE in systems with zero net magnetization.

Theoretical models illustrate the role of magnetic charge in AHE phenomena.

Abstract

The anomalous Hall effect (AHE) can appear in certain antiferromagnetic metals when it is allowed by symmetry. Since the net magnetization is usually small in such anomalous Hall antiferromagnets, it is useful to have other physical indicators of the AHE that have the same symmetry properties as the latter and can be conveniently measured and calculated. Here we propose such indicators named as electronic chiralization (EC), which are constructed using spatial gradients of spin and charge densities in general periodic crystals, and can potentially be measured directly by scattering experiments. Such constructions particularly reveal the important role of magnetic charge in the AHE in unconventional magnetic systems with vanishing net magnetization. Guided by the EC we give two examples of the AHE when magnetic charge is explicitly present: A minimum honeycomb model inspired by the magnetic-charge-ordered phase of kagome spin ice, and skew scattering of two-dimensional Dirac electrons by magnetic charge.