We consider scaling of the entanglement entropy across a topological quantum phase transition for the Kitaev chain model. The change of the topology manifests itself in a subleading term, which scales as L-1/α with the size of the subsystem L, here α is the Rényi index. This term reveals the scaling function hα(L/ξ), where ξ is the correlation length, which is sensitive to the topological index. The scaling function hα(L/ξ) is independent of model parameters, suggesting some degree of its universality.
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This work was supported by NSF Grant No. DMR-1608238.
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