Quantum Anomalous Hall Effect in a Perovskite and Inverse-Perovskite Sandwich Structure

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Based on first-principles calculations, we propose a sandwich structure composed of a G-type anti-ferromagnetic (AFM) Mott insulator LaCrO₃ grown along the [001] direction with one atomic layer replaced by an inverse-perovskite material Sr₃PbO. We show that the system is in a topologically nontrivial phase characterized by simultaneous nonzero charge and spin Chern numbers, which can support a spin-polarized and dissipationless edge current in a finite system. Since these two materials are stable in bulk and match each other with only small lattice distortions, the composite material is expected easy to synthesize.