Effective k . p model of monolayer 1T′-MoS2 under perpendicular electric field

We derive the effective k center dot p Hamiltonian for an electron in monolayer T'-MoS2 near the Fermi level in the presence of spin-orbit coupling and a perpendicular electric field. The 4 x 4 k center dot p Hamiltonian is capable of describing the nonparabolic energy band dispersion, perpendicular electric field effect, and spin texture, in good agreement with first-principles calculations. This k center dot p Hamiltonian provides a simple and convenient way to understand and manipulate the spin transport properties of monolayer T'-MoS2 under the perpendicular electric field. Surprisingly, our model predicts a significantly large out-of-plane spin polarization (S-z) induced by the charge current along the x direction. We also prove that the mirror symmetry (sigma(h)(y(z))) leads to the forbidden of spin polarization (S-z) induced by the charge current along the y direction.