Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.174301
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Funding
- NSF [CMMI-1951221, CMMI-2039463]
- Moore Postdoctoral Fellowship at Princeton University
- Eberly Postdoctoral Fellowship at the Pennsylvania State University
- National Natural Science Foundation of China [11922416]
- Hong Kong Research Grants Council [12302420, 12300419]
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In this study, a paradigm is devised and experimentally validated in acoustic lattices, which allows topological states to bind to disclinations without a fractional density of states but with preserved chiral symmetry. This study provides new insights into the interplay between symmetry protection in topological phases and topological defects, with potential applications in classical and quantum systems alike.
Building upon the bulk-boundary correspondence in topological phases of matter, disclinations have recently been harnessed to trap fractionally quantized density of states (DOS) in classical wave systems. While these fractional DOS have associated states localized to the disclination???s core, such states are not protected from deconfinement due to the breaking of chiral symmetry, generally leading to resonances which, even in principle, have finite lifetimes and suboptimal confinement. Here, we devise and experimentally validate in acoustic lattices a paradigm by which topological states bind to disclinations without a fractional DOS but which preserve chiral symmetry. The preservation of chiral symmetry pins the states at the midgap, resulting in their protected maximal confinement. The integer DOS at the defect results in twofold degenerate states that, due to symmetry constraints, do not gap out. Our study provides a fresh perspective about the interplay between symmetry protection in topological phases and topological defects, with possible applications in classical and quantum systems alike.
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