Spurious topological entanglement entropy from subsystem symmetries
Quantum Physics
2020-04-16 v2 Strongly Correlated Electrons
Abstract
We demonstrate that linear combinations of subregion entropies with canceling boundary terms, commonly used to calculate the topological entanglement entropy, may suffer from spurious nontopological 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.
Keywords
Cite
@article{arxiv.1808.05221,
title = {Spurious topological entanglement entropy from subsystem symmetries},
author = {Dominic J. Williamson and Arpit Dua and Meng Cheng},
journal= {arXiv preprint arXiv:1808.05221},
year = {2020}
}
Comments
5+8 pages, 2+5 figures; v2 published version