Scalar Spin Chirality induced Quantum Anomalous Hall effects

The quantum anomalous Hall effect(QAHE) is one of the major signature of topological matter. While conventional QAHE originates from spin-orbit coupling, scalar spin chirality(SSC) is another candidate for the emergence of non-trivial QAHE, yet SSC dominant regime is still ongoing topic. In this work, we investigate competition between explicit SSC and hopping on the decorated honeycomb lattice. By analysis of weak and strong SSC limits, we find the system exhibits quantum phase transition from Chern insulator to antiferromagnetic SSC phase. We discuss the crossover between these regimes, with the phase diagram and spin correlations, offering a new perspective on SSC-driven topological transport.