Linear magnetochiral effect in Weyl semimetals

TL;DR

This paper predicts a linear magnetochiral effect in Weyl semimetals, where magnetotransport coefficients depend linearly on magnetic field and momentum, revealing new transport phenomena related to Weyl node separation.

Contribution

It introduces the concept of a linear magnetochiral effect in Weyl semimetals, linking it to the Weyl node separation vector and Onsager relations, with implications for magnetotransport.

Findings

Linear magnetochiral effect exists in Weyl semimetals.

Positive longitudinal magnetoconductivity observed above certain Fermi energies.

The effect is tied to the Weyl node separation vector and symmetry considerations.

Abstract

We suggest the possibility of a linear magnetochiral effect in time reversal breaking Weyl semimetals. Generically the magnetochiral effect consists in a simultaneous linear dependence of the magnetotransport coefficients with the magnetic field and a momentum vector. This simultaneous dependence is allowed by the Onsager reciprocity relations, being the separation vector between the Weyl nodes the vector that plays such role. As a side consequence, we find a non vanishing positive longitudinal magnetoconductivity at Fermi energies above the point where the chirality of the Weyl nodes is globally lost.