TY - JOUR
T1 - Observation of a Higher-Order Topological Bound State in the Continuum
AU - Cerjan, Alexander
AU - Jürgensen, Marius
AU - Benalcazar, Wladimir A.
AU - Mukherjee, Sebabrata
AU - Rechtsman, Mikael C.
N1 - Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/11/17
Y1 - 2020/11/17
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.125.213901
DO - 10.1103/PhysRevLett.125.213901
M3 - Article
C2 - 33274969
AN - SCOPUS:85097147082
SN - 0031-9007
VL - 125
JO - Physical review letters
JF - Physical review letters
IS - 21
M1 - 213901
ER -