The quantum anomalous Hall effect and strong robustness in two-dimensional p-state Dirac half-metals YX (Y = Li, Na; X = Se, Te).

Based on first-principles calculations, we have predicted a novel group of 2D p-state Dirac half-metal (DHM) materials, YX (Y = Li, Na; X = Se, Te) monolayers. All the monolayers exhibit intrinsic ferromagnetism. Among them, LiTe and NaSe open topologically nontrivial band gaps of 4.