Ill-chosen reference states induce spurious long-range strange correlators in trivial SPT phases through magnitude degeneracy of the transfer matrix in MPS representations.
Oshikawa, HiddenZ 2∗Z2 symmetry in quantum spin chains with arbitrary integer spin, J
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Spurious Strange Correlators in Symmetry-Protected Topological Phases
Ill-chosen reference states induce spurious long-range strange correlators in trivial SPT phases through magnitude degeneracy of the transfer matrix in MPS representations.