A classification of symmetry enriched topological phases with exactly solvable models

Understand

Recently a new class of quantum phases of matter: symmetry protected topological states, such as topological insulators, attracted much attention.

• In presence of interactions, group cohomology provides a classification of these [X.
• Chen et al., arXiv:1106.4772v5 (2011)].
• These phases have short-ranged entanglement, and no topological order in the bulk.