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 field, the 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.
Keywords
Cite
@article{arxiv.1811.08392,
title = {Symmetry-Breaking Topological Insulators in the $\mathbb{Z}_2$ Bose-Hubbard Model},
author = {Daniel González-Cuadra and Alexandre Dauphin and Przemysław R. Grzybowski and Paweł Wójcik and Maciej Lewenstein and Alejandro Bermudez},
journal= {arXiv preprint arXiv:1811.08392},
year = {2019}
}