Observation of Coherent Perfect Acoustic Absorption at an Exceptional Point
Non-Hermitian systems have recently shown new possibilities to manipulate wave scattering by exploiting loss, yet coherent perfect absorption at an exceptional point (CPA EP) remains elusive in acoustics. Here, we demonstrate it based on a two-channel waveguide with compact lossy resonators. We realize imbalanced losses crucial for CPA EP by using active components to independently modulate the non-Hermiticity. The CPA EP experimentally manifests as full absorption at a unique real frequency and shows high sensitivity to the incident phase variations. Our findings open an avenue to explore novel non-Hermitian physics for classical waves and develop innovative acoustic singularity-based devices.
Authors
- Y. L. Yan
- Bin Liang (ORCID: https://orcid.org/0000-0003-2655-9024)
- Jian‐Chun Cheng (ORCID: https://orcid.org/0000-0003-0475-9295)
- Jing Yang (ORCID: https://orcid.org/0000-0002-3125-8691)
- Johan Christensen (ORCID: https://orcid.org/0000-0002-1604-250X)
- An Chen (ORCID: https://orcid.org/0000-0002-9926-5548)
- Zixiang Xu (ORCID: https://orcid.org/0000-0003-0155-6783)
- Karl J. Friston
Institutions
- IMDEA Materials (ES)
- Nanjing University (CN)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-07-18
- DOI
- https://doi.org/10.1103/slhy-f76q
- Citations
- 6
- Primary Topic
- Quantum Mechanics and Non-Hermitian Physics
- Type
- article
- Field-Weighted Citation Impact
- 7.48
Funders
- National Natural Science Foundation of China
- Ministerio de Ciencia e Innovación
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Key Research and Development Program of China