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29 March 2024
 
  » arxiv » 1909.3025

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Combined spontaneous symmetry-breaking and symmetry-protected topological order from cluster charge interaction
Chen Peng ; Rong-Qiang He ; Yuan-Yao He ; Zhong-Yi Lu ;
Date 6 Sep 2019
AbstractThe study of symmetry-protected topological states in presence of electron correlations has recently aroused great interest as rich and exotic phenomena can emerge. Here, we report a concrete example by employing large-scale unbiased quantum Monte Carlo study of the Kane-Mele model with cluster charge interactions. The ground-state phase diagram for the model at half filling is established. Our simulation identifies the coexistence of a symmetry-protected topological order with a symmetry-breaking Kekul$acute{e}$ valence bond order and shows that the spontaneous symmetry-breaking is accompanied by an interaction-driven topological phase transition (TPT). This TPT features appearance of zeros of single-particle Green’s function and gap closing in spin channel rather than single-particle excitation spectrum, and thus has no mean-field correspondence.
Source arXiv, 1909.3025
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