Current-induced spin polarization in monolayer InSe

We find that perpendicular electric fields can give rise to a tunable current-induced spin polarization in monolayer InSe. The interplay between the Rashba and the intrinsic Dresselhaus spin-orbit coupling leads to several Lifshitz transitions near the valence band maxima. Interestingly, the sign of the spin polarization changes with increasing perpendicular electric fields. We propose a spin potentiometric device to measure current-induced spin polarization.