{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T14:34:22Z","timestamp":1793198062455,"version":"4.5.0"},"reference-count":43,"publisher":"American Physical Society (APS)","issue":"18","license":[{"start":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T00:00:00Z","timestamp":1793145600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2022YFA1404400"],"award-info":[{"award-number":["2022YFA1404400"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12474463"],"award-info":[{"award-number":["12474463"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["journals.aps.org"],"crossmark-restriction":true},"short-container-title":["Phys. Rev. Lett."],"accepted":{"date-parts":[[2026,10,6]]},"abstract":"<jats:p>In non-Hermitian physics, coherent perfect absorption at an exceptional point (CPA EP) emerges as a unique degenerate state that can manifest anomalously broadened absorption line shape implying strong robustness, which apparently contradicts the extreme sensitivity rooted in EPs. To investigate this unique state, we design an underwater acoustic metasurface comprising a beam splitter and a retroreflector on opposite sides. We leverage fluid-solid interaction (FSI) as a powerful mechanism to engineer the non-Hermitian coupling, circumventing the necessity for difficult-to-tune gain or loss for the degeneracy. FSI-induced strong nonlocal elastodynamic coupling concurrently morphs the previously independent spatial subspaces, creating contrasting non-Hermitian behaviors in the respective subspaces, with one encoding the projected CPA EP. We prove that the CPA EP inherits core attributes from both states, manifesting the coexistence of macroscopic operational robustness (from CPA) and microscopic topological hypersensitivity (from EP). We further experimentally demonstrate that the CPA EP, in turn, acts as a knob to modulate the FSI coupling channel, allowing its full activation (for perfect anomalous deflection) or, by leveraging the missing dimension, complete suppression (for total reflection). This synergy between FSI and non-Hermitian degeneracies shows potential for multifunctional hydroacoustic devices.<\/jats:p>","DOI":"10.1103\/87nl-4ypz","type":"journal-article","created":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T14:44:36Z","timestamp":1791297876000},"update-policy":"https:\/\/doi.org\/10.1103\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Projected Coherent Perfect Absorption at Exceptional Points via Nonlocal Elastodynamic Coupling"],"prefix":"10.1103","volume":"137","author":[{"given":"Jingyi","family":"Chen","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}],"name":"Tongji University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Di","family":"Wang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03rc6as71","id-type":"ROR","asserted-by":"publisher"}],"name":"Tongji 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