Natural extension of hidden Z2 × Z2 symmetry toward arbitrary integer spin chains
Abstract
We show how entangled valence-bond singlet pairs are disentangled partially and totally by the Kennedy-Tasaki transformation which reveals the hidden Z2× Z2 symmetry in valence-bond-solid chains as a higher-spin generalization of the previous studies toward the intermediate-D state. The totally disentangled states correspond to four Ising-like states with Z2 variables on the boundary. We present a simple expression of results by using the spin decomposition and the boundary matrix.
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