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The nontrivial band gap plays a critical role in quantum anomalous Hall (QAH)insulators. In this work, we propose that the intrinsic QAH phase with sizableband gaps up to 367 meV is achieved in two-dimensional hexagonal organometallicframeworks (HOMFs). Based on first-principles calculations and effective modelanalysis, we uncover that these large band gaps in transition metal based HOMFsare opened by strong spin-orbital coupling of the localized 4d or 5d electrons.Importantly, we reveal that Coulomb correlations can further significantlyenhance the nontrivial band gaps. In addition, we suggest a possible avenue togrow these organometallic QAH insulators on a semiconducting SiC(111)substrate, and the topological features are perfectly preserved due to the vander Waals interaction. Our work shows that the correlation remarkably enhancesthe nontrivial band gaps, providing exotic candidates to realize the QAH statesat high temperatures.

Large Band Gap Quantum Anomalous Hall Phase in Hexagonal Organometallic Frameworks