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Topological Subspace-Induced Bound State in the Continuum.

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Researchers demonstrated a novel topological bound state in the continuum (BIC) by coupling one-dimensional chains. This topological BIC, a localized state within extended states, was experimentally confirmed in coupled acoustic resonators.

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Area of Science:

  • Condensed Matter Physics
  • Topological Physics
  • Acoustics

Background:

  • Bound states in the continuum (BICs) are unique quantum phenomena where localized states coexist with extended states.
  • Topological physics offers novel ways to engineer robust states of matter.
  • Coupling of simple systems can lead to complex emergent phenomena.

Purpose of the Study:

  • To propose and experimentally realize a new type of bound state in the continuum (BIC).
  • To explore the potential of coupled one-dimensional chains with inversion symmetry for topological BICs.
  • To investigate the bulk-boundary correspondence in engineered topological systems.

Main Methods:

  • Theoretical proposal of coupled one-dimensional chains with inversion symmetry.
  • Utilizing the concept of Hilbert space separation into topological and nontopological subspaces.
  • Experimental realization using coupled acoustic resonators.

Main Results:

  • Demonstration of a novel topological BIC arising from bulk-boundary correspondence.
  • Observation of a localized interface state within the continuum of extended states.
  • Experimental validation in a system of coupled acoustic resonators.

Conclusions:

  • A new class of topological BICs has been successfully proposed and experimentally realized.
  • The findings highlight the interplay between topology and continuum states in engineered systems.
  • This work opens avenues for novel applications in wave manipulation and quantum technologies.