ArXiv · 2026
The interplay of antiferromagnetic order, momentum-dependent Bloch spin-splitting, time-reversal (T), and parity (P) symmetries in non-relativistic systems has emerged as a central theme for spintronics. Two well-known examples are P-preserving and T-violating altermagnets and P-violating and T-preserving odd-parity magnets. Here we examine a class of coplanar AFMs with a translation invariant vector spin chiral (VSC) order that preserves both P and T symmetries but breaks the non-relativistic spin-rotational invariance. Naively, such a VSC order is not expected to exhibit unusual phenomena. Here we show that the spin-rotational symmetry breaking generated by this VSC order can take on multiple forms, including ferroaxial symmetry breaking. We further show that these states allow for non-relativistic and non-dissipative purely longitudinal (or purely transverse) spin-conductivities. These states also allow the generation of non-relativistic altermagnetic spin-splittings through circularly polarized light. We identify 16 candidate materials in the Magndata database for which our theory is applicable and provide effective microscopic models and DFT-based results that highlight the large emergent spin conductivities.
Try inveni