Abstract
The quantum anomalous Hall (QAH) phase is a topological state of matter characterized by a nonzero quantized Hall conductivity without an external magnetic field. The realizations of the QAH effect, however, are experimentally challengeable. Based on ab initio calculations, here, we propose an intrinsic QAH phase in the Mn–dicyanoanthracene (DCA) Kagome lattice. The nontrivial topology in Kagome bands is confirmed by the nonzero Chern number, quantized Hall conductivity, and gapless chiral edge states of the Mn-DCA lattice. A tight-binding model is further constructed to clarify the origin of the QAH effect. Furthermore, its Curie temperature, estimated to be ∼253 K using the Monte-Carlo simulation, is comparable with room temperature and higher than that of most of the two-dimensional ferromagnetic thin films. Our findings present a reliable material platform for the observation of the QAH effect in covalent-organic frameworks.
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