  Ising (Zeeman-type) spin-orbit coupling (SOC) generated by in-plane inverse
asymmetry has attracted considerable attention, especially in Ising
superconductors and spin-valley coupling physics. However, many unconventional
observations and emerging physical phenomena remain to be elucidated. Here, we
theoretically study the spin texture of {\sigma}_z (spin angular momentum
projection along z) induced by Ising SOC in 1Td WTe2, and propose an
unconventional spin-to-charge conversion named inverse Ising effect, in which
the directions of the spin current, spin polarization and charge current are
not orthogonal. In particular, we predict the Ising magnetoresistance, whose
resistance depends on the out-of-plane magnetic momentum in WTe2/ferromagnetic
heterostructure. The Ising magnetoresistance is believed to be an interesting
counterpart to the well studied spin Hall magnetoresistance. Our predictions
provide promising way to spin-momentum locking and spin-charge conversion based
on emerging Ising SOC.
