Figure 5. Magnetization angle dependence of the voltage due to spin pumping and inverse Edelstein effect.

(a,b) Schematic drawings for the in-plane (a) and out-of-plane (b) spin polarization injection into the surface states of SmB₆. The in-plane spin polarization injection leads to the generation of the in-plane electric field due to inverse Edelstein effect, while the out-of-plane spin injection is forbidden due to the spin–momentum locking properties of the surface states of SmB₆, which have been shown to be topological in previous studies. (c) V_SP as a function of θ_M. Inset: the schematic illustration of the coordinate system for θ_M.