Room Temperature Ferromagnetic Semiconductors and Quantum Anomalous Hall Effect in Two-Dimensional Materials

To obtain room temperature ferromagnetic semiconductor is one of big challenges in science, and also premises essentially to realize room temperature quantum anomalous Hall effect (QAHE), both of which are quite expected for long time. Here we report that, based on first-principles calculations, PdCl3 and PtBr3 monolayers are not only room temperature ferromagnetic semiconductors with out-of-plane magnetization but also can implement room temperature QAHE. Monte Carlo simulations give Curie temperatures 470 K and 375 K for PdCl3 and PtBr3 monolayers, respectively. These two-dimensional materials are Chern insulators with energy band gaps of 96 meV and 28 meV, respectively, quite well in favor of observing room temperature QAHE. The large band gaps were unveiled from multi-orbital electron correlations. The present work sheds new light on developing room temperature ferromagnetic semiconductors as well as observing room temperature QAHE in experiments.