Spin orientation and strain tuning valley polarization with magneto-optic Kerr effects in ferrovalley VS_2 monolayer

摘要

Recently, two-dimensional ferrovalley materials have attracted increasing interest due to their intrinsic ferromagnetism and valley polarization. The 2H VS_2 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 VS_2 monolayer. These results provide a theoretical reference for practical applications involving valley polarization and magneto-optic Kerr effects in 2D ferrovalley materials.