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Two-dimensional layered electrides possessing anionic excess electrons in theinterstitial spaces between cationic layers have attracted much attention dueto their promising opportunities in both fundamental research and technologicalapplications. Using first-principles calculations, we predict that the layeredbulk electride Zr2S is nonmagnetic with massive Dirac nodal-line states arisingfrom Zr-4d cationic and interlayer anionic electrons. However, the Zr2S(001)surface increases the density of states at the Fermi level caused by thesurface potential, thereby inducing a ferromagnetic order at the outermost Zrlayer via the Stoner instability. Consequently, the time-reversal symmetrybreaking at the surface not only generates highly spin-polarized topologicalsurface states with intricate helical spin textures, but also hosts anintrinsic anomalous Hall effect originating from the Berry curvature generatedby spin-orbit coupling. Our findings offer a playground to investigate theemergence of ferromagnetism and anomalous Hall transport at the surface ofnonmagnetic topological electrides.

Surface-induced ferromagnetism and anomalous Hall transport at Zr2S(001)