Chiral anomaly induced nonlinear Hall effect in three-dimensional chiral fermions

Chiral fermionic quasiparticles emerge in certain quantum condensed matter systems such as Weyl semimetals, topological insulators, and spin-orbit-coupled noncentrosymmetric metals. Here, a comprehensive theory of the chiral anomaly induced nonlinear Hall effect (CNLHE) is developed for three-dimensional chiral quasiparticles, advancing previous models by rigorously including momentum-dependent chirality-preserving and chirality-breaking scattering processes and global charge conservation. Focusing on two specific systems [Weyl semimetals (WSMs) and spin-orbit-coupled noncentrosymmetric metals (SOC-NCMs)], we uncover that the nonlinear Hall conductivity in WSMs shows nonmonotonic behavior with the Weyl cone tilt and experiences a ``strong-sign reversal'' with increasing internode scattering, diverging from earlier predictions. For SOC-NCMs, where nonlinear Hall conductivity has been less explored, we reveal that unlike WSM, the orbital magnetic moment alone can drive a large CNLHE with distinctive features: the CNLH conductivity remains consistently negative regardless of interband scattering intensity and exhibits a quadratic dependence on the magnetic field, contrasting the linear dependence in WSMs. Furthermore, we discover that in SOC-NCMs the spin Zeeman coupling of the magnetic field acts like an effective tilt term which can further enhance the CNLH current. These findings offer fresh insights into the nonlinear transport dynamics of chiral quasiparticles and can be verified in upcoming experiments on such materials.