Negative magnetoresistance and sign change of the planar Hall effect due to the negative off-diagonal effective-mass in Weyl semimetals

Abstract

We theoretically investigated the magnetoresistance (MR) and planar Hall effect (PHE) in Weyl semimetals based on the semiclassical Boltzmann theory, focusing on the fine structure of the band dispersion. We identified that the negative longitudinal MR and sign change in the PHE occur because of the negative off-diagonal effective-mass with no topological effects or chiral anomaly physics. Our results highlight the crucial role of the off-diagonal effective-mass, which can cause anomalous galvanomagnetic effects. We propose that the PHE creates a dip in their temperature dependence, which enables the experimental detection of the Weyl point.

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• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Negative longitudinal magnetoresistance in Dirac and Weyl metals
• Large longitudinal magnetoresistance of multivalley systems
• Longitudinal and transverse magnetoresistance of SrTiO${}_3$ with a single closed Fermi surface

Cited by in corpus (6)

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• Planar Hall Plateau in Magnetic Weyl Semimetals
• Quantum oscillations of the nonlinear planar effects signifying chiral anomaly in Weyl Semimetals
• Pseudo anomalous Hall effect in semiconductors and semimetals: A classical perspective
• Negative transverse magnetoresistance due to negative off-diagonal mass in linear dispersion materials
• The orbital-driven topological phase transition and planar Hall responses in ternary tellurides Weyl semi-metals