  Based on a topological transition of the symmetry protected topological phase
(SPT), an interaction induced topological charge pump (iTCP) is proposed with
the symmetry breaking parameter as a synthetic dimension. It implies that the
phase boundary of the SPT is the topological obstruction although iTCP and the
gap closing singularity is stable for symmetry breaking perturbations. We have
confirmed the bulk-edge correspondence for this iTCP using DMRG for the
Rice-Mele model with nearest-neighbor interactions. As for a realization in
optical lattices, an interaction sweeping pump protocol is proposed as well.
