Theory of Magnetic-Texture-Induced Anomalous Hall Effect on the Surface of Topological Insulators

TL;DR

This paper derives an analytical formula for the anomalous Hall conductivity on topological insulator surfaces influenced by magnetic textures, highlighting the dependence on skyrmion shape and magnetic configurations.

Contribution

It provides a third-order perturbative analytical expression for Hall conductivity considering magnetic textures on topological insulators, extending understanding of magnetic texture effects.

Findings

Hall conductivity depends on skyrmion shape (Bloch or Néel)

Analytical formula up to third order in magnetization

Applicable to various magnetic structures

Abstract

The anomalous Hall effect is caused by magnetic textures such as skyrmions. We derive an analytical formula of the Hall conductivity on the surface of a topological insulator up to third order in magnetization, $\boldsymbol{M}(\boldsymbol{x})$, based on a perturbative approach. We identify the magnetic textures that contribute to the Hall conductivity up to third order in magnetization and second order in spatial differentiation. We treat magnetization as a perturbation to calculate the Hall conductivity for each magnetic texture based on the linear response theory. Furthermore, we estimate the skyrmion-induced Hall conductivity and confirm that it depends on the shape of skyrmions, such as Bloch-type or N\'eel-type skyrmions. The results of this study can be applied not only to conventional skyrmion systems but also to more general magnetic structures.