Anomalous chiral magnetic effect in time reversal symmetry breaking Weyl semimetals

TL;DR

This paper introduces a dissipationless current mechanism in Weyl semimetals via the anomalous chiral magnetic effect, which does not rely on external magnetic fields or chiral anomaly, and predicts observable magnetoresistance and Hall effects.

Contribution

It proposes the anomalous chiral magnetic effect as a new way to generate dissipationless current in Weyl semimetals without external magnetic fields or chiral anomaly dependence.

Findings

ACME induces observable antisymmetric linear magnetoresistance.

ACME causes a planar Hall conductivity.

The effect is driven by chiral imbalance and Weyl node separation.

Abstract

We propose a mechanism to generate dissipationless current in time reversal symmetry breaking Weyl semimetals through the anomalous chiral magnetic effect (ACME). The ACME current is induced by chiral imbalance and flows along the direction of the Weyl nodes separation in momentum space. In contrast to the chiral magnetic effect, the ACME is not related to the chiral anomaly and does not require external magnetic field. In the presence of parallel electric and magnetic fields, the ACME gives rise to an antisymmetric linear magnetoresistance and a planar Hall conductivity, which we estimate to be observable.