Tensor network representations of finite group symmetries with a 4-cocycle index are introduced, and their associated gapped phases and SPT models are characterized.
Ignacio Cirac, and David P´ erez-Garc ´ ıa
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On two-dimensional tensor network group symmetries
Tensor network representations of finite group symmetries with a 4-cocycle index are introduced, and their associated gapped phases and SPT models are characterized.