Boundary degeneracy of topological order

@article{Wang2015BoundaryDO,
  title={Boundary degeneracy of topological order},
  author={Juven C. Wang and Xiao-Gang Wen},
  journal={Physical Review B},
  year={2015},
  volume={91},
  pages={125124}
}
We introduce the concept of boundary degeneracy of topologically ordered states on a compact orientable spatial manifold with boundaries, and emphasize that the boundary degeneracy provides richer information than the bulk degeneracy. Beyond the bulk-edge correspondence, we find the ground state degeneracy of the fully gapped edge modes depends on boundary gapping conditions. By associating different types of boundary gapping conditions as different ways of particle or quasiparticle… Expand

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