A diagnosis scheme for topological degeneracies at high-symmetry momenta
arXiv:1910.11730 · doi:10.1103/PhysRevResearch.2.022066
Abstract
Theories of symmetry-based indicators and topological quantum chemistry, while powerful in diagnosing gapped topological materials, cannot be directly applied to diagnosing band degeneracies at high-symmetry momenta due to the violation of the compatibility conditions. Here we design a recursive protocol that utilizes indicators of maximal subgroups to infer the topological nature of band degeneracies at high-symmetry lines. For demonstration, the method is used to predict the existence of iso-energy Weyl points and a node-line cage, respectively, in the phonon bands of In2Te and ZrSiO.
arXiv comment6 pages, 5 figures
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