Charge pumping induced by magnetic texture dynamics in Weyl semimetals

TL;DR

This paper demonstrates that dynamic magnetic textures in Weyl semimetals can induce a Joule-heating-free electric current, acting as a Hall current driven by axial electromagnetic fields, with a specific focus on magnetic domain walls.

Contribution

It reveals a novel mechanism where magnetic texture dynamics in Weyl semimetals generate a charge-pumping current without Joule heating, expanding understanding of spin-momentum locking effects.

Findings

Magnetic texture dynamics induce a pumped electric current.

The pumped current is free from Joule heating.

Moving domain walls generate localized charge corresponding to the current.

Abstract

Spin-momentum locking in Weyl semimetals correlates the orbital motion of electrons with background magnetic textures. We show here that the dynamics of a magnetic texture in a magnetic Weyl semimetal induces a pumped electric current that is free from Joule heating. This pumped current can be regarded as a Hall current induced by axial electromagnetic fields equivalent to the magnetic texture. Taking a magnetic domain wall as a test case, we demonstrate that a moving domain wall generates a pumping current corresponding to the localized charge.