Field-Induced Weyl-Like Crossings and Longitudinal Magnetoconductivity in Dirac Systems
The study uses quantum electrodynamics to investigate how a magnetic field can induce Weyl-like crossings in Dirac systems, transforming them into Weyl semimetals with separated nodes. This topological transition is linked to a pseudoscalar invariant (${f E} imes{f B}$) that generates a chiral current, leading to negative longitudinal magnetoresistance and providing a link between electromagnetic response and transport.