Interaction Induced Topological Charge Pump

TL;DR

This paper proposes an interaction-induced topological charge pump based on symmetry protected topological phase transitions, confirmed via DMRG, with potential realization in optical lattices.

Contribution

It introduces a novel topological charge pump driven by interactions and symmetry breaking, expanding the understanding of topological phases and their manipulation.

Findings

Confirmed bulk-edge correspondence using DMRG.

Demonstrated stability of the topological phase under symmetry breaking.

Proposed a feasible optical lattice implementation.

Abstract

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.