Abstract
We study the topologically ordered surface state of three-dimensional bosonic SPT phases with the discrete symmetries . It has been argued that the topologically ordered state cannot be realized on a purely two-dimensional lattice model. We carefully examine the statement and show that the surface state should break if the symmetry is gauged on the surface. This manifests the conflict of the symmetry and on the surface of the three-dimensional SPT phase. Given that there is no such phenomena in the purely two-dimensional model, it signals that the symmetries are encoded anomalously on the surface of the three-dimensional SPT phases and that the surface state can never be realized on the purely two-dimensional models.
- Received 18 March 2014
- Revised 18 May 2014
DOI:https://doi.org/10.1103/PhysRevB.89.235103
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