Topological Subspace-Induced Bound State in the Continuum

Yi Xin Xiao, Guancong Ma, Zhao Qing Zhang, C.  T. Chan*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

137 Citations (Scopus)


We propose and experimentally realize a new kind of bound states in the continuum (BICs) in a class of systems constructed by coupling multiple identical one-dimensional chains, each with inversion symmetry. In such systems, a specific separation of the Hilbert space into a topological and a nontopological subspace exists. Bulk-boundary correspondence in the topological subspace guarantees the existence of a localized interface state which can lie in the continuum of extended states in the nontopological subspace, forming a BIC. Such a topological BIC is observed experimentally in a system consisting of coupled acoustic resonators.

Original languageEnglish
Article number166803
Number of pages5
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 21 Apr 2017

Scopus Subject Areas

  • Physics and Astronomy(all)


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