Symmetry-breaking topological insulators in the Z(2) Bose-Hubbard model | |
Article | |
关键词: QUANTIZED HALL CONDUCTANCE; PHASE-TRANSITION; CHERN NUMBER; EDGE STATES; QUANTUM; SOLITONS; SUPERFLUID; BOSONS; BANDS; | |
DOI : 10.1103/PhysRevB.99.045139 | |
来源: SCIE |
【 摘 要 】
We study a one-dimensional model of interacting bosons coupled to a dynamical Z(2) field, the 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 topological phase of noninteracting bosons, and thus constitutes an instance of an interaction-induced symmetry-breaking topological insulator.
【 授权许可】
Free