Insight into the quantum anomalous Hall states in two-dimensional kagome Cr 3 Se 4 and Fe 3 S 4 monolayers.

To realize the quantum anomalous Hall (QAH) effect in two-dimensional (2D) intrinsic magnetic materials, which combines insulating bulk states and metallic edge channel states, is still challenging in experiment. Here, based on first-principles calculations, we predicted two stable kagome-latticed QAH insulators: CrSe and FeS monolayers, with the Chern number = 1. It is found that both structures exhibit a large magnetic anisotropy energy and sizable band gaps, and a topological phase transition from = -1 to = 1 occurs when the magnetization orientation changes from the -axis to the --axis. Remarkably, the non-trivial topological properties are robust against biaxial strains of up to ±6%. Furthermore, a variable high Chern number of = 2 or = 3 can be observed by stacking two or three layers of the QAH monolayer with an MoS insulator. Our results signify that such layered kagome materials can be promising platforms for exploring novel QAH physics.