▎ 摘　　要

Moire patterns of two-dimensional (2D) van der Waals (vdW) heterostructures can induce novel electronic structures and physical properties. However, the effects of moire pattern on magnetic properties of 2D materials are not clear yet. Herein, the electronic structures and magnetic properties of 2D graphene/Janus 2H-VSeTe (Gr/ VSeTe) heterostructures with moire patterns are investigated by density functional theory. It is found that twist angles (theta) can induce a band gap at Dirac cone of graphene. With further considering spin-orbit coupling and V magnetic moments of VSeTe monolayer along + z axis, valley polarization of graphene at K and K' points appears and is found to be sensitive to the twist angle. Additionally, flat band occurs at theta = 5.2 degrees and 10.9 degrees due to the quasi-periodic potential induced by moire patterns. A high spin polarization also appears in Gr/VSeTe heterostructures with certain twist angles of theta = 0 degrees, 7.6 degrees, 10.9 degrees and 13.9 degrees. Due to the changed occupation of interfacial Te-p orbitals, the magnetic anisotropy and Dzyaloshinskii-Moriya interaction of Gr/VSeTe heterostructures can be changed by twist angles. Therefore, twist angle provides a new degree of freedom for inducing the novel electronic structures and magnetic properties in the 2D magnetic vdW heterostructures.