Replication Data for: Persistent spin textures, altermagnetism and charge-to-spin conversion in metallic chiral crystals TM3X6

Here, we show that materials from the chiral dichalcogenide family TM3X6 (T = 3d, M = 4d/5d, X = S) exhibit persistent spin texture (PST) - unidirectional spin polarization of states across large regions of the reciprocal space - in their nonmagnetic metallic phase.

Using the example of NiTa3S6 and NiNb3S6, we show that PSTs cover the full Fermi surface, a rare and desirable feature that enables efficient charge-to-spin conversion and suggests long spin lifetimes and coherent spin transport above magnetic ordering temperatures. At low temperatures, the materials that order antiferromagnetically become chiral altermagnets, where spin textures originating from spin-orbit coupling and altermagnetism combine in a way that sensitively depends on the orientation of the Neel vector.