# Spin-to-charge conversion in magnetic Weyl semimetals

## TL;DR

This paper theoretically investigates spin-to-charge conversion in magnetic Weyl semimetal and normal metal bilayers, revealing unique anisotropic effects and dependencies on spin orientation and Fermi level, advancing understanding of topological spintronics.

## Contribution

It introduces the first detailed theoretical analysis of spin-to-charge conversion in magnetic Weyl semimetal/normal metal heterostructures, highlighting their unique anisotropic behavior.

## Key findings

- Charge current vanishes along the magnetization direction regardless of spin injection.
- Conversion efficiency depends on spin orientation and Fermi level position.
- Unique band structure of magnetic WSMs causes anisotropic spin-to-charge conversion.

## Abstract

Weyl semimetals (WSMs) are a newly discovered class of quantum materials which can host a number of exotic bulk transport properties, such as the chiral magnetic effect, negative magneto-resistance, and the anomalous Hall effect. In this work, we investigate theoretically the spin-to-charge conversion in a bilayer consisting of a magnetic WSM and a normal metal (NM), where a charge current can be induced in the WSM by an spin current injection at the interface. We show that the induced charge current exhibits a peculiar anisotropy: it vanishes along the magnetization orientation of the magnetic WSM, regardless of the direction of the injected spin. This anisotropy originates from the unique band structure of magnetic WSMs and distinguishes the spin-to-charge conversion effect in WSM/NM structures from that observed in other systems, such as heterostructures involving heavy metals or topological insulators. The induced charge current depends strongly on injected spin orientation, as well as on the position of the Fermi level relative to the Weyl nodes and the separation between them. These dependencies provide additional means to control and manipulate spin-charge conversion in these topological materials.