Chemical design of monolayer altermagnets.

The crystal-symmetry-paired spin-momentum locking (CSML), arising from the intrinsic crystal symmetry that connects different magnetic sublattices in altermagnets, enables many exotic spintronics properties, such as unconventional piezomagnetism and non-collinear spin currents. However, the shortage of monolayer altermagnets restricts further exploration of dimensionally confined phenomena and applications of nanostructured devices. Here, we propose general chemical design principles inspired by sublattice symmetry of the layered altermagnet V[Formula: see text](Se,Te)[Formula: see text]O through symmetry-preserving structural modification and valence-adaptive chemical substitutions. In total, we construct…