Author(s): F. Gómez-Ortiz, S. Mamoudou Taganga, Emma E. McCabe, A. H. Romero, and E. Bousquet With growing interest in structural chirality in periodic solids, it has been suggested that chirality might constitute a new ferroic order parameter. In the work described, we demonstrate, by means of a formal group-theoretical proof and a systematic group-subgroup analysis, that achiral-to-chiral … [Phys. Rev. Lett. 137, 036103] Published Fri Jul 17, 2026