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