The manipulations of light-induced chiral edge states in monolayer noncollinear antiferromagnet Sc3C6O6

The quantum anomalous Hall effect (QAHE) is a hallmark of topological quantum states, which has attracted significant attention due to its dissipationless transport characteristics. This study theoretically investigates the dynamic modulation of QAHE in two-dimensional non-collinear antiferromagnetic (NAFM) kagome organic-metal framework Sc3C6O6 under both resonant and non-resonant schemes via Floquet engineering. First-principles calculations demonstrate that in monolayer Sc3C6O6, the NAFM state exhibits superior magnetic stability compared to the collinear ferromagnetic state, while possessing a symmetry-protected Dirac point below the Fermi level, this characteristic differentiates it from the lower-energy but topologically trivial antiferromagnetic state. Circularly polarized light (CPL) dynamically breaks mirror symmetry, thereby opening a topologically non-trivial band gap and generating quantized anomalous Hall conductance. By rotating the magnetic moments, we obtained three typical configurations: Type-I (e.g., φ= 0{degree sign}) exhibits stable QAHE; Type-II (e.g., φ= 60{degree sign}) is topologically trivial; Type-III (e.g., φ= 150{degree sign}) enables optically tunable edge states. Further investigation under low-energy CPL (ℏω = 0.2eV) reveals chiral-inverted edge channels and higher optical modulation sensitivity, with the required light intensity for quantization reduced by 30% compared to the high-energy regime. This work establishes Sc3C6O6 as an ideal NAFM platform for studying non-equilibrium topological states and provides a feasible strategy for manipulating QAHE in frustrated magnets.