Local twist operators and a purity-gap-based chiral marker provide practical real-space indicators of topology in finite-temperature mixed states of the SSH model.
The partition function in the trivial limit is Z= 1 + eβt1 1 + e−βt1 N ,(18) and by simplifying the quotient between Eq
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Characterizing topology at nonzero temperature: Topological invariants and indicators in the extended SSH model
Local twist operators and a purity-gap-based chiral marker provide practical real-space indicators of topology in finite-temperature mixed states of the SSH model.