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Recently, two-dimensional layered electrides have emerged as a new class ofmaterials which possess anionic electron layers in the interstitial spacesbetween cationic layers. Here, based on first-principles calculations, wediscover a time-reversal-symmetry-breaking Weyl semimetal phase in a uniquetwo-dimensional layered ferromagnetic (FM) electride Gd$_2$C. It is revealedthat the crystal field mixes the interstitial electron states and Gd 5$d$orbitals near the Fermi energy to form band inversions. Meanwhile, the FM orderinduces two spinful Weyl nodal lines (WNLs), which are converted into multiplepairs of Weyl nodes through spin-orbit coupling. Further, we not only identifyFermi-arc surface states connecting the Weyl nodes but also predict a largeintrinsic anomalous Hall conductivity due to the Berry curvature produced bythe gapped WNLs. Our findings demonstrate the existence of Weyl fermions in theroom-temperature FM electride Gd$_2$C, therefore offering a new platform toinvestigate the intriguing interplay between electride materials and magneticWeyl physics.

Ferromagnetic Weyl Fermions in Two-Dimensional Layered Electride Gd$_2$C