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The authors formulate a nonperturbative semiclassical magnetotransport theory for gapped nodal-line semimetals, deriving exact all-order magnetic-field expressions for both intrinsic Hall response and dissipative Fermi-surface conductivity from a minimal two-band model. They show that orbital magnetic moments directly reconstruct the Fermi surface to lift the azimuthal cancellation native to the nodal-line geometry, switching on an intrinsic Hall effect that is strictly absent at zero field. Crucially, the resulting Hall current exhibits strongly nonlinear field dependence and nonmonotonic chemical potential scaling, driving a pronounced planar Hall effect when the Fermi level approaches the nodal ring.
Magnetic fields do not merely perturb transport in nodal-line semimetals—they actively switch on a hidden intrinsic Hall current by reshaping the Fermi surface to shatter azimuthal geometric cancellations.
We develop a nonperturbative semiclassical theory of magnetotransport in gapped nodal-line semimetals, retaining the full magnetic-field dependence of Berry-curvature and orbital-magnetic-moment corrections. Starting from a minimal two-band model, we derive exact expressions for both the intrinsic Hall response and the dissipative Fermi-surface conductivity, valid to all orders in the magnetic field within the semiclassical regime. We show that the orbital magnetic moment reconstructs the geometrically active Fermi surface, breaking the azimuthal cancellation imposed by the nodal-line geometry and thereby activating an intrinsic Hall current that is absent at zero magnetic field. The Hall response exhibits a pronounced nonmonotonic dependence on the chemical potential and a strongly nonlinear magnetic-field evolution, reflecting the redistribution of geometrically active states around the nodal ring. We further demonstrate that the Fermi-surface conductivities recover the conventional Drude behavior in the weak-field limit, while acquiring quadratic and ultimately nonperturbative magnetic-field corrections together with a field-induced transport anisotropy that gives rise to a measurable planar Hall effect at intermediate fields. Both the intrinsic and dissipative responses are strongly enhanced when the Fermi level lies close to the nodal ring, where Berry curvature and orbital magnetic moment are largest. Our results identify magnetic-field-activated geometric transport as a characteristic signature of nodal-line semimetals and provide a unified framework for describing magnetotransport beyond perturbative magnetic-field expansions, together with experimentally accessible signatures of orbital-magnetic-moment physics.