First principles prediction of the valley Hall effect in ScBrCl monolayer

Two-dimensional (2D) ferrovalley materials with valley-dependent Hall effect have attracted great interest due to their significant applications in spintronics. In this paper, by using first-principles computational simulations, we predict that the ScBrCl monolayer is a 2D ferrovalley material with valley-dependent multiple Hall effects. After calculations, we found that the ScBrCl monolayer has excellent thermodynamic stability and kinetic stability, and has a high magnetic transition temperature. When the magnetization direction is turned from in-plane to out-of-plane, a large valley polarization of 44 meV can be generated. In particular, under 5.1%–5.3% tensile strain conditions, ScBrCl monolayer can achieve quantum anomalous Hall effect, and further prove its existence through non-zero Chern number and non-trivial edge state. Our discovery enriches the research on valley-dependent Hall effect and promotes the potential application of 2D Janus monolayer in valley electronics.