Exact density matrix for the Kitaev honeycomb spin liquid is organized by string-operator equivalence classes, producing a symmetry-resolved block-diagonal reduced density matrix that explains extensive entanglement-spectrum degeneracy and entropy separability into gauge and matter sectors.
Yu,Gauge symmetry in Kitaev-type spin models and index theorems on odd manifolds, Nuclear Physics B799, 345 (2008)
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Exact Organization of Density Matrices and Entanglement Structure in the Kitaev Spin Liquid
Exact density matrix for the Kitaev honeycomb spin liquid is organized by string-operator equivalence classes, producing a symmetry-resolved block-diagonal reduced density matrix that explains extensive entanglement-spectrum degeneracy and entropy separability into gauge and matter sectors.