Interplay of the orbital magnetic moment and the chiral magnetic effect in Shubnikov-de Haas quantum oscillations

TL;DR

This paper investigates how the orbital magnetic moment and chiral magnetic effect influence Shubnikov-de Haas quantum oscillations in Weyl metals, revealing a double-peak structure linked to their interplay.

Contribution

It demonstrates that the combined effects of the orbital magnetic moment and chiral magnetic effect can be observed as a double-peak in SdH oscillations, detailing experimental conditions for this phenomenon.

Findings

Double-peak structure in SdH oscillations identified

Interplay of effects causes kink in Landau fan diagram

Experimental conditions for observing the double-peak established

Abstract

Emergent Lorentz symmetry and chiral anomaly are well known to play an essential role in anomalous transport phenomena of Weyl metals. In particular, the former causes a Berry-curvature induced orbital magnetic moment to modify the group velocity of Weyl electrons, and the latter results in the chiral magnetic effect to be responsible for a "dissipationless" longitudinal current channel of the bulk. In this study, we verify that intertwined these two effects can be measured in Shubnikov-de Haas (SdH) quantum oscillations, where a double-peak structure of the SdH oscillation appears to cause a kink in the Landau fan diagram. We examine three different cases which cover all possible experimental situations of external electric/magnetic fields and identify the experimental condition for the existence of the double-peak structure. We claim that interplay of the orbital magnetic moment and the chiral magnetic effect in SdH quantum oscillations is an interesting feature of the Weyl metal state.