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

Abstract

Emergent Lorentz symmetry and chiral anomaly are well known for playing 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 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 under 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.