Mapping of momentum-space topological singularities in photonic lattices with hybrid pseudospin-1 Dirac-like cones

We experimentally demonstrate higher-order topological charge conversion, exhibiting a vortex pair of identical helicities that can be reversed altogether by selectively mapping different momentum-space topological singularities in photonic T-graphene lattices with integer pseudospin-1 Dirac-like cones.