Symmetry-Based Tight-Binding Hamiltonian for Monolayer 1T'-MoS 2 : Spin Textures and Spin-Resolved Transport in Nanoribbons

We develop a four-band tight-binding model for monolayer 1T'-MoS 2 under a perpendicular electric field (PEF), which reproduces the non-parabolic band dispersion, field effects, and spin texture in agreement with first-principles calculations. Using this model, we show that charge carriers in nanoribbons exhibit net spin polarization solely along the s x direction, with the s y and s z components canceled by mirror symmetry σ yz h . The spin conductance of 1T'-MoS 2 nanoribbons is calculated using the non-equilibrium Green's function (NEGF) method combined with the tight-binding model, revealing that the s x -polarized spin conductance induced by the PEF remains robust against impurities when the Fermi level is located within the topological band gap.