File Name : figure4.png Caption : fig. 4 (a) select four k-paths,the points a, b, c, d are equally spaced between m and k. the two nodal lines in the brillouin zone are labeled nl1 and nl2, respectively. (b) the band structures of the γ-a/b/c/d paths. (c) and (d) the 3d band dispersion of the k_z = 0 plane around points γ and k, respectively. File Name : figures1.png Caption : fig. s1 band structures for mo₂se₃ by pbe + u and hse method. File Name : figures2.png Caption : fig. s2 contribution of splitting orbitals to the band structures of monolayer mo₂se₃ at the pbe + u level without considering soc effects. the color intensity shows the amplitude of the orbital-resolved character. File Name : figures3.png Caption : fig. s3 spatial spin density distribution of mo₂se₃ monolayer for the different magnetic configurations in a 2 × 2 × 1 supercell with the isosurface value set as 0.0008 e/bohr³. the red and blue colors refer to the spin-up and spin-down densities, respectively. File Name : figures4.png Caption : fig. s4 the mo-d and se-p orbital-resolved maes of the mo₂se₃monolayer. File Name : figures5.png Caption : fig. s5 (a) top view showing the nearest (n), next-nearest (nn), and next-next-nearest (nnn) exchange-coupling parameters j_n, j_nn, and j_nnn for the mo₂se₃ monolayer. (b) exchange coupling parameters and single-ion magnetic anisotropy parameter for the 2 × 2 × 1 supercell. File Name : figures6.png Caption : fig. s6 the mo-d and se-p orbital-resolved maes of the mo₂se₃ monolayer under different strains. File Name : figures7.png Caption : fig. s7 the projected density of states of mo-d and se-p orbitals of mo₂se₃ monolayer under different strains.