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- W4225706883 abstract "We introduce a many-body topological invariant, called the topological disorder parameter (TDP), to characterize gapped quantum phases with global internal symmetry in $2+1$ dimensions. TDP is defined as the constant correction that appears in the ground-state expectation value of a partial symmetry transformation applied to a connected spatial region $M$, the absolute value of which scales generically as $exp(ensuremath{-}ensuremath{alpha}l+ensuremath{gamma})$ where $l$ is the perimeter of $M$ and $ensuremath{gamma}$ is the TDP. Motivated by a topological quantum field theory interpretation of the operator, we show that ${e}^{ensuremath{gamma}}$ can be related to the quantum dimension of the symmetry defect, and provide a general formula for $ensuremath{gamma}$ when the entanglement Hamiltonian of the topological phase can be described by a ($1+1$)-dimensional conformal field theory (CFT). A special case of TDP is equivalent to the topological R'enyi entanglement entropy when the symmetry is the cyclic permutation of the replica of the gapped phase. We then investigate several examples of lattice models of topological phases, both analytically and numerically, in particular when the assumption of having a CFT edge theory is not satisfied. We also consider an example of partial translation symmetry in Wen's plaquette model and show that the result can be understood using the edge CFT. Our results establish an alternative tool to detect quantum topological order." @default.
- W4225706883 created "2022-05-05" @default.
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- W4225706883 date "2022-09-12" @default.
- W4225706883 modified "2023-10-04" @default.
- W4225706883 title "Topological disorder parameter: A many-body invariant to characterize gapped quantum phases" @default.
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- W4225706883 doi "https://doi.org/10.1103/physrevb.106.094415" @default.
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