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】

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