Symmetry-Breaking Topological Insulators in the ${\mathbb{Z}}_2$ Bose-Hubbard Model

Abstract

In this work, we study a one-dimensional model of interacting bosons coupled to a dynamical ${\mathbb{Z}}_2$ field, the ${\mathbb{Z}}_2$ Bose-Hubbard model, and analyze the interplay between spontaneous symmetry breaking and topological symmetry protection. In a previous work, we showed how this model exhibits a spontaneous breaking of the translational symmetry through a bosonic Peierls transition. Here we find how, at half filling, the resulting phase also displays topological features that coexist with the presence of long-range order and yields a topological bond order wave. Using both analytical and numerical methods, we describe the properties of this phase, showing that it cannot be adiabatically connected to a bosonic topological phase with vanishing Hubbard interactions, and thus constitutes an instance of an interaction-induced symmetry-breaking topological insulator.

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