On gapped boundaries for SPT phases beyond group cohomology
Strongly Correlated Electrons
2024-10-22 v1 High Energy Physics - Theory
Abstract
We discuss a strategy to construct gapped boundaries for a large class of symmetry-protected topological phases (SPT phases) beyond group cohomology. This is done by a generalization of the symmetry extension method previously used for cohomological SPT phases. We find that this method allows us to construct gapped boundaries for time-reversal-invariant bosonic SPT phases and for fermionic Gu-Wen SPT phases for arbitrary finite internal symmetry groups.
Keywords
Cite
@article{arxiv.1905.05391,
title = {On gapped boundaries for SPT phases beyond group cohomology},
author = {Ryohei Kobayashi and Kantaro Ohmori and Yuji Tachikawa},
journal= {arXiv preprint arXiv:1905.05391},
year = {2024}
}
Comments
22 pages, 4 figures