Chiral magnetic effect in lattice models of tilted multi-Weyl semimetals

TL;DR

This paper investigates the chiral magnetic effect in tilted multi-Weyl semimetals using a lattice model, revealing how tilt influences CME, especially near phase transitions, with Berry curvature playing a key role.

Contribution

It introduces a lattice model analysis of CME in tilted multi-Weyl semimetals, highlighting the effects of tilt and phase transitions on the phenomenon.

Findings

CME peaks at the Lifshitz transition point.

Berry curvature drives CME in higher monopole charge WSMs.

Tilt modifies CME behavior near phase transitions.

Abstract

We study the chiral magnetic effect (CME) in tilted multi-Weyl Semimetals (WSM) employing a two-band lattice model. We focus on the type-II phase of mWSMs, introduced by incorporating a Lorentz symmetry violating tilt term. We add to the understanding of the CME (and anomalous Hall effect) in the type-II phase of mWSMs and near the Lifshitz transition by varying tilt. Like the elementary WSM, our results also indicate that the Berry curvature drives the CME for higher monopole charges. We find a peak in the CME at the transition point and discuss its significance using the density of states. Along the way we also examine both observables as a function of the energy separation of the Weyl points.