Strain-engineering induced topological phase transitions and multiple valley states in Janus monolayer VCSiN4

For out-of-plane magnetic anisotropy, when 1.04 < a / a 0 < 1.043, the Quantum anomalous valley Hall effect is appeared in a ferrovalley monolayer: the Janus monolayer VCSiN 4 , which the edge state has a significant trait of chiral spin-valley locking.