Room Temperature Quantum Anomalous Hall Insulator in a Honeycomb Lattice, RuCS3, with Large Magnetic Anisotropy Energy

The quantum anomalous Hall (QAH) effect has attracted enormous attention since it can induce topologically protected conducting edge states in an intrinsic insulating material. For practical quantum applications, the main obstacle is the non-existent room temperature QAH systems, especially with both large topological band gap and robust ferromagnetic order. Here, according to first-principles calculations, we predict the realization of the room temperature QAH effect in a two-dimensional (2D) honeycomb lattice, RuCS 3 with a non-zero Chern number of C = 1. Especially, the nontrivial topology band gap reaches up to 336 meV for RuCS 3 . Moreover, we find that RuCS 3 has a large magnetic anisotropy energy (2.065 meV) and high Curie temperature (696 K). We further find that the non-trivial topological properties are robust against the biaxial strain. The robust topological and magnetic properties make RuCS 3 have great applications in room temperature spintronics and nanoelectronics.