Universal route for the emergence of exceptional points in PT-symmetric metamaterials with unfolding spectral symmetries
نویسندگان
چکیده
We introduce a class of Parity-Time symmetric elastodynamic metamaterials (Ed-MetaMater) whose Hermitian counterpart exhibits frequency spectrum with unfolding (fractal) symmetries. Our study reveals scale-free formation exceptional points (EP) density is dictated by the fractal dimension their spectra. Demonstrated in quasi-periodic Aubry-Harper, geometric H-tree-fractal, and an aperiodic Fibonacci Ed-MetaMater, universal route for EP-formation established via coupled mode theory model controllable spectrum. This universality will enable rational design novel Ed-MetaMater hypersensitive sensing elastic wave control.
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ژورنال
عنوان ژورنال: New Journal of Physics
سال: 2021
ISSN: ['1367-2630']
DOI: https://doi.org/10.1088/1367-2630/ac09c9