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Lattice model for fermionic toric code
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DOI：10.1103/PhysRevB.90.085140.png)
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Abstract
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The Z(2) topological order in Z(2) spin liquid and in the exactly solvable Kitaev toric code model is the simplest topological order for 2 + 1D bosonic systems. More general 2 + 1D bosonic topologically ordered states can be constructed via exactly solvable string-net models. However, the most important topologically ordered phases of matter are arguably the fermionic fractional quantum Hall states. Topological phases of matter for fermion systems are strictly richer than their bosonic counterparts because locality has different meanings for the two kinds of systems. In this paper, we describe a simple fermionic version of the toric code model to illustrate many salient features of fermionic exactly solvable models and fermionic topologically ordered states.
Keywords:
QUANTUM HALL STATES
DEGENERACY
SYSTEMS
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