Axial Current driven by Magnetization Dynamics in Weyl Semimetals

TL;DR

This paper theoretically investigates how magnetization dynamics in a magnetic insulator can induce an axial current in a doped Weyl semimetal, with potential applications in low-power electronics.

Contribution

It demonstrates that magnetization dynamics can control axial currents in Weyl semimetals, revealing a new mechanism for energy-efficient electronic devices.

Findings

Axial current is driven by magnetization dynamics.

Induced axial current detectable via ferromagnetic resonance or inverse spin Hall effect.

Potential for converting axial current into charge current without energy loss.

Abstract

We theoretically study the axial current $\bm{j}_5$ (defined as the difference between the charge current with opposite chirality) in doped Weyl semimetal using a Green's function technique. We show that the axial current is controlled by the magnetization dynamics in a magnetic insulator attached to a Weyl semimetal. We find that the induced axial current can be detected by using ferromagnetic resonance or the inverse spin Hall effect and can be converted into charge current with no accompanying energy loss. These properties make Weyl semimetal advantageous for application to low-consumption electronics with new functionality.