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Due to the potential applications in the low-power-consumption spintronicdevices, the quantum anomalous Hall effect (QAHE) has attracted tremendousattention in past decades. However, up to now, QAHE was only observedexperimentally in topological insulators with Chern numbers C= 1 and 2 at verylow temperatures. Here, we propose three novel two-dimensional stable kagomeferromagnets Co3Pb3S2, Co3Pb3Se2and Co3Sn3Se2that can realize QAHE with highChern number of |C|=3. Monolayers Co3Pb3S2, Co3Pb3Se2 and Co3Sn3Se2 possess thelarge band gap of 70, 77 and 63 meV with Curie temperature TC of 51, 42 and 46K, respectively. By constructing a heterostructure Co3Sn3Se2/MoS2, its TC isenhanced to 60 K and the band gap keeps about 60 meV due to the tensile strainof 2% at the interface. For the bilayer compound Co6Sn5Se4, it becomes ahalf-metal, with a relatively flat plateau in its anomalous Hall conductivitycorresponding to |C| = 3 near the Fermi level. Our results provide newtopological nontrivial systems of kagome ferromagnetic monolayers andheterostructrues possessing QAHE with high Chern number |C| = 3 and large bandgaps.

Kagome quantum anomalous Hall effect with high Chern number and large band gap