First-principles study of novel two-dimensional altermagnets

Two-dimensional (2D) magnetic materials have attracted considerable attention with the growing effort to utilize magnetic properties across various fields, and the emergence of altermagnetism has further stimulated interest in 2D magnetic systems. In this study, we search for novel 2D altermagnets from the first-principles calculations. We consider 2D atomic layers with a glide-plane symmetry connecting the opposite-spin sublattices. We examine the dynamic stability of each material by calculating phonon dispersions and elastic constants, and we analyze their electronic structures and magnetic properties, including Heisenberg exchange interactions, magnon frequencies, and Neel temperatures. Our study to find 2D altermagnetic materials may provide valuable insights for future development of low-dimensional spintronics materials.