摘要
In this work, based on symmetry analysis and first-principles calculations, we propose a realistic route to engineer robust altermagnetism in monolayer FeSe, a prototypical iron-based superconductor, by designing a stoichiometric Fe2Se2Cl structure with gate-tunable hole doping. The resulting altermagnetic state exhibits a giant spin splitting of up to 620 meV and persists even in a 10-layer slab model.