Symmetry-Protected Topological Orders in Interacting Bosonic Systems

@article{Chen2012SymmetryProtectedTO,
  title={Symmetry-Protected Topological Orders in Interacting Bosonic Systems},
  author={Xie Chen and Zheng-Cheng Gu and Zhengxin Liu and Xiao-Gang Wen},
  journal={Science},
  year={2012},
  volume={338},
  pages={1604 - 1606}
}
Symmetry Semantics Topological insulators (TIs) are characterized by boundary states that are protected by time-reversal symmetry. A systematic study of this, and other symmetry-protected states, is possible in noninteracting systems, but complications arise when interactions are present. Chen et al. (p. 1604; see the Perspective by Qi) used group cohomology theory to predict symmetry-protected phases of interacting bosons. The analysis enabled the generalization of a known result in one… 
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