期刊
PHYSICAL REVIEW B
卷 80, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.075111
关键词
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资金
- PFI [EJ-GV]
- DGS [FIS2006-04885]
- ESF [INSTANS 2005-10]
We introduce a two-body quantum Hamiltonian model of spin 1/2 on a two-dimensional spatial lattice with exact topological degeneracy in all coupling regimes. There exists a gapped phase in which the low-energy sector reproduces an effective color code model. High-energy excitations fall into three families of anyonic fermions that turn out to be strongly interacting. The model exhibits a Z(2) x Z(2) gauge-group symmetry and string-net integrals of motion, which are related to the existence of topological charges that are invisible to moving high-energy fermions.
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