Journal
PHYSICAL REVIEW MATERIALS
Volume 2, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.2.125203
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Funding
- Multidisciplinary University Research Initiative grant from the Office of Naval Research [N00014-13-1-0631]
- Emerging Frontiers in Research and Innovation grant from the National Science Foundation [1641084]
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Exceptional points (EPs) are responsible for a number of interesting phenomena in non-Hermitian wave systems. Here we show, both theoretically and experimentally, that EPs can be synthesized in non-Hermitian acoustic systems with unbalanced loss factors in different sections. Numerical simulations and measurements confirm that unidirectional zero reflection, one of the hallmarks of EPs, can be realized in such a compact system with controlled Willis coupling and loss. When approached from one direction in the parameter space, the material slab mimics a conventional parity-time (PT) symmetric system. Our findings provide an efficient way for advanced engineering of scattering properties of artificial acoustic materials with EP-related physics.
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