Planar Hall effect in Weyl semimetals induced by pseudoelectromagnetic fields

TL;DR

This paper explores how strain-induced pseudoelectromagnetic fields in Weyl semimetals can induce nonlinear phenomena like the planar Hall effect, revealing chirality-dependent responses and potential applications in chiralitytronics.

Contribution

It provides a theoretical framework using chiral kinetic theory to analyze the effects of pseudo-fields on magnetoconductivity and the planar Hall effect in strained Weyl semimetals, highlighting chirality-dependent phenomena.

Findings

Pseudo-fields induce nonlinear effects such as PHE in Weyl semimetals.

Chirality-dependent responses are significant due to opposite coupling of pseudo-fields.

Results suggest new avenues for chiralitytronics applications.

Abstract

The planar Hall effect (PHE), the appearance of an in-plane transverse voltage in the presence of coplanar electric and magnetic fields, has been ascribed to the chiral anomaly and Berry curvature effects in Weyl semimetals. In the presence of position- and time-dependent perturbations, such as strain, Weyl semimetals react as if they would be subjected to emergent electromagnetic fields, kwnon as pseudo-fields. In this paper we investigate the possibility of inducing nonlinear phenomena, including the PHE, in strained Weyl semimetals. Using the chiral kinetic theory in the presence of pseudo-fields, we derive general expressions for the magnetoconductivity tensor by considering the simultaneous effects of the Berry curvature and orbital magnetic moment of carriers, which are indeed of the same order of magnitude. Since pseudo-fields couple to the Weyl fermions of opposite chirality with opposite signs, we study chirality-dependent phenomena, including the longitudinal magnetoconductivity and the planar Hall effect. We discuss our results in terms of the chiral anomaly with pseudo-fields. These may open new possibilities in chiralitytronics.