Effects of anisotropy on the high field magnetoresistance of Weyl semimetals

TL;DR

This paper investigates how anisotropy influences the magnetoresistance in Weyl semimetals under high magnetic fields, revealing angle-dependent effects and scaling relations based on Fermi velocities.

Contribution

It introduces a theoretical analysis of anisotropic effects on magnetoresistance in Weyl semimetals, highlighting angle dependence and velocity scaling in the ultraquantum regime.

Findings

Magnetoresistance strongly depends on the orientation of anisotropy axes.

The ratio of magnetoresistances scales as $(v_ot/v_ op)^2$.

Anisotropy causes significant angle-dependent variations in magnetoresistance.

Abstract

We study the effects of anisotropy on the magnetoresistance of Weyl semimetals (WSMs) in the ultraquantum regime. We utilize the fact that many Weyl semimetals are approximately axially anisotropic. We find that anisotropy manifests itself in the strong dependence of the magnetoresistance on the polar and azimuthal angles determining the orientation of the anisotropy axis with respect to the applied magnetic field and electric current. We also predict that the ratio of magnetoresistances in the geometries, where the magnetic field and anisotropy axes are aligned and where they are orthogonal, scales as $(v_\bot/v_\parallel)^2$ where $v_\bot$ and $v_\parallel$ are the corresponding Fermi velocities.