Observation of a Higher-Order Topological Bound State in the Continuum

Alexander Cerjan, Marius Jürgensen, Wladimir A. Benalcazar, Sebabrata Mukherjee, Mikael C. Rechtsman

Research output: Contribution to journalArticlepeer-review

116 Scopus citations


Higher-order topological insulators are a recently discovered class of materials that can possess zero-dimensional localized states regardless of the dimension of the system. Here, we experimentally demonstrate that the topological corner-localized modes of higher-order topological systems can be symmetry-protected bound states in the continuum; these states do not hybridize with the surrounding bulk states of the lattice even in the absence of a bulk band gap. This observation expands the scope of bulk-boundary correspondence by showing that protected boundary-localized states can be found within topological bands, in addition to being found in between them.

Original languageEnglish (US)
Article number213901
JournalPhysical review letters
Issue number21
StatePublished - Nov 17 2020

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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