Observation of metastable chiral domain walls in a topological magnet

We report the first direct probe of spin-valley excitations and nonequilibrium dynamics of a quantum anomalous Hall insulator in twisted MoTe2 moiré superlattices. Using pump probe spectroscopy, our measurements uncover a long-lived metastable spin-valley excitation that survives under reverse magnetic fields several times larger than the saturation field. We propose these excitations stem from chiral domain walls whose metastability is driven by a universal interplay between real-space topological winding and momentum-space quantum geometry. Beyond revealing a new class of neutral excitations in topological magnets, our work establishes how quantum geometry affects the nonequilibrium response and fundamental stability limits of topological protection in correlated quantum matter.