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Nonlinear planar magnetotransport is ubiquitous in topological HgTestructures, both in tensile (topological insulator) or compressively strainedlayers (Weyl semimetal phase). We show that the common reason for the nonlinearplanar magnetotransport is the presence of tilted Dirac cones combined with theformation of charge puddles. The origin of the tilted Dirac cones is the mix ofthe Zeeman term due to the in-plane magnetic field and quadratic contributionsto the dispersion relation. We develop a network model that mimics transport oftilted Dirac fermions in the landscape of charge puddles. The model capturesthe essential features of the experimental data. It should be relevant fornonlinear planar magnetotransport in a variety of topological and small bandgap materials.

Nonlinear planar magnetotransport due to tilted Dirac cones in topological materials