Revisiting magnetotransport in Weyl semimetals

Abstract

A series of recent papers have claimed that intranode scattering, alone, can contribute to positive longitudinal magnetoconductance (LMC) due to chiral anomaly (CA) in Weyl semimetals (WSMs). We revisit the problem of CA induced LMC in WSMs, and show that intranode scattering, by itself, does not result in enhancement of LMC. In the limit of zero internode scattering, chiral charge must remain conserved, which is shown to actually decrease LMC. Only in the presence of a non-zero internode scattering (however weak), one obtains a positive LMC due to non-conservation of chiral charge. Even weak internode scattering suffices in generating positive LMC, since it redistributes charges across both the nodes, although on a time scale larger than that of the intranode scattering. Furthermore, our calculations reveal that, in contrast to recent works, in inhomogeneous WSMs strain induced axial magnetic field $B_5$, by itself, leads to negative longitudinal magnetoconductance and a negative planar Hall conductance.

5 pages, 6 figures

References in corpus (7)

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• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Thermoelectric properties of Weyl and Dirac semimetals
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Cited by in corpus (8)

• Longitudinal magnetoconductance and the planar Hall conductance in inhomogeneous Weyl semimetals
• Chiral anomaly and positive longitudinal magnetoresistance in the type-II Dirac semimetals $A_x$PdTe${}_2$ (\textit{A} = Cu, Ag)
• Chiral anomaly-induced nonlinear Hall effect in spin-orbit coupled noncentrosymmetric metals
• Disentangling contributions to longitudinal magnetoconductivity for Kramers-Weyl nodes
• Quantum Hall Effect in a Weyl-Hubbard Model: Interplay between Topology and Correlation
• Distinguishing features of longitudinal magnetoconductivity for a Rarita-Schwinger-Weyl node
• Chiral Anomaly Induced Transverse Planar Transport Phenomena in Three Dimensional Spin-Orbit Coupled Metals
• Effect of trivial bands on chiral anomaly-induced longitudinal magnetoconductivity in Weyl semimetals