期刊
PHYSICAL REVIEW LETTERS
卷 122, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.122.140506
关键词
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资金
- Yale University
We demonstrate that linear combinations of subregion entropies with canceling boundary terms, commonly used to calculate the topological entanglement entropy, may suffer from spurious non-topological contributions even in models with zero correlation length. These spurious contributions are due to a specific kind of long-range string order and persist throughout certain subsystem symmetry-protected phases. We introduce an entropic quantity that measures the presence of such order, and hence should serve as an order parameter for the aforementioned phases.
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