2026/07/19 by C. O. Ascencio, D. J. P. de Sousa, Seungjun Lee +1
#cond-mat.mes-hall #cond-mat.mtrl-sci
We classify the symmetry-constrained forms of the Berry curvature dipole D, gyrotropic magnetic tensor K, and magnetoelectric electro-optic (EO) tensor G, which describe metallic optical and EO effects in time-reversal symmetric, noncentrosymmetric metals. We identify 11 space groups (SGs) in which D and K vanish by symmetry while G remains allowed, thereby providing a more direct route to observing the recently predicted magnetoelectric EO effects associated with G. First-principles based calculations confirm that D and K vanish for representative materials, while G remains allowed and tunable via Fermi level shifting. We further show that the choices of SG and experimental configuration provide complementary paths for isolating G-driven EO effects, including cases where D and K are also symmetry-allowed. In an oblique-incidence geometry, the D-driven response produces a helicity-even absorption or gain correction, whereas the G-driven response couples the s and p optical sectors and produces a bias-induced circular dichroism with a characteristic sinθcosθ angular dependence. This provides a direct experimental route for separating the D- and G-driven EO signatures in noncentrosymmetric metals.