Nonreciprocal spin-polarized conductivity in magnetic Weyl semimetals

The nonreciprocity of the spin-polarized conductivity is examined in magnetic Weyl semimetals, where different Weyl nodes exhibit nonidentical dispersion relations. Such a condition naturally arises in materials with crystalline symmetries that allow a finite tilt in the Weyl cones. A theoretical analysis reveals that the resulting anisotropy in the fermionic velocities, particularly if aligned along an applied electric field, can give rise to disparate, direction-dependent conductivities when the chiral anomaly redistributes carriers between Weyl nodes of opposite chirality. A significant enhancement of the effect can also be observed by utilizing the axial magnetic field B 5 , which can be introduced by inhomogeneous magnetization such as that associated with a domain wall confined within a magnetic Weyl semimetal. Numerical calculations demonstrate a nonreciprocal response with a robust rectification ratio between the forward and reverse currents over a broad range of material and structure parameters including at small electric fields. The effect is particularly prominent under conditions in which the conventional rectification mechanisms relying on the Boltzmann factor become ineffective (such as at low biases and high temperatures).