Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.213901
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Funding
- U.S. Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Robust Photonic Materials with High-Order Topological Protection [N00014-20-1-2325]
- ONRYoung Investigator Award [N00014-18-1-2595]
- Packard Foundation [2017-66821]
- Eberly Postdoctoral Fellowship at the Pennsylvania State University
- Verne M. Willaman Distinguished Graduate Fellowship at the Pennsylvania State University
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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.
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