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Why we call the ground state of Kitaev model a Spin Liquid?

Now we always talk about the so-called Kitaev spin liquid. One important property of spin liquid is global spin rotation symmetry. Let $\Psi$ represents a spin ground state, if $\Psi$ has global spin ...
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A simple model that exhibits emergent symmetry?

In a previous question Emergent symmetries I asked, Prof.LuboŇ° Motl said that emergent symmetries are never exact. But I wonder whether the following example is an counterexample that has exact ...