Quantum Anomalous Hall Effect in Two-dimensional Ferromagnetic NpF Monolayer with High Curie Temperature

Abstract

The quantum anomalous Hall (QAH) effect remains a hot topic due to its potential applications in quantum computing and low-energy electronics. Here, based on first-principles calculations and symmetry analysis, we present a new type of two-dimensional (2D) QAH insulator NpF monolayer. Our results show that the NpF monolayer favors ferromagnetic order with high Curie temperature up to 240K. In the absence of spin-orbital coupling (SOC), NpF monolayer is ferromagnetic Weyl semimetal with a nodal loop near fermi level. When SOC with out-of-plane magnetization is taken into account, the NpF monolayer becomes a QAH insulator with C = -1, accompanied by a nontrivial band gap of 24.12 meV. When the magnetization lies in-plane and all mirror symmetries are broken, tunable Chern-number (i.e., C = ± 1) phase emerges as a function of azimuthal angles. These discoveries highlight the versatility of QAH platforms and emphasize the interplay between magnetism, topology, and spin-orbit interactions in engineering quantum phases for advanced electronic applications.