Quantum Anomalous Hall Effect in Two-dimensional Organic Mn₂L₃ Lattice

Using first-principles calculations, we predict the existence of nontrivial topological states in a monolayer metal-organic framework Mn₂L₃ (L = C₆O₄Cl₂), which has been experimentally synthesized. A band gap of 7.8 meV at the Dirac point near the Fermi level is opened by spin-orbital coupling, with the attributes of C and O p-orbitals mediated by Mn d-orbitals. We further construct a tight-binding model to characterize the nonzero Chern number and edge states within the Dirac gap, confirming its nontrivial topological properties. Our results suggest that Mn₂L₃ could provide an organic platform for developing low-energy-consumption spintronics devices based on the quantum anomalous Hall effect.