It was recently predicted that alkali-metal-based half-Heusler compounds have robust half-metallicity with
wide band gaps (1.60-2.38 eV), and the half-metallicity is retained at surface and under severe strain. In this
study, we investigate the half-metallicity and electronic structure of the LiCrSb/InSb hybrid system to reveal
real applicability of an alkali-metal-based half-Heusler compound to spintronics using first-principles calculations.
Half-metallicity at the interface is well retained, and a proximate effect opens a gap in the minority spin
band of the InSb layer with band gaps of 0.55-0.65 eV. The whole LiCrSb/InSb hybrid system prefers magnetization
parallel to the plane.