Photonic topological pump between chiral disclination states

Topological pump describes the quantized transport of charges (or particles) in the absence of a net external electric or magnetic field. Here the authors show that topological pumps can happen between disclination states with different chiralities in a distorted lattice. By constructing structures with one and two disclination cores, they achieve topological pumping both within a single disclination core and between different disclination cores.