Spin orientation and strain tuning valley polarization with magneto-optic Kerr effects in ferrovalley VS2 monolayer

Abstract

Recently, two-dimensional ferrovalley materials have attracted increasing interest due to their intrinsic ferromagnetism and valley polarization. The 2H VS2 monolayer is taken as an example, and our calculations indicate that the spin direction and strain can modify its valley splitting while further leading to a strong dependence of the Kerr signals. Moreover, the strain-tuned magnetocrystalline anisotropic energy and magnetostrictive coefficient provide a strong magnetostriction in the 2H VS2 monolayer. These results provide a theoretical reference for practical applications involving valley polarization and magneto-optic Kerr effects in 2D ferrovalley materials.