The properties of artificial materials can be tailored to exhibit extraordinary properties by cleverly engineering their composition. The development of such metamaterials is a prominent thrust in engineering today. One of the greatest challenges is to engineer metamaterials that manipulate waves by design. Of particular interest are elastic waves, since numerous mechanical applications require their control; vibration isolation, ultrasonography, energy harvesting and cloaking, to name a few. The forefront of research in wave control emerged from a seemingly unrelated theory, quantum mechanics, with the development of its non-Hermitian formalism, describing nonconservative systems that exchange energy with their environment. By drawing analogies between this formalism and those of classical systems, researchers have discovered phenomena that defy intuition, phenomena such as zero reflection and chiral absorption, and have exploited them to control light, sound, and elastic waves. Can we go beyond these analogies? The answer is hidden in the tensorial nature of elastodynamics, a nature that is unparalleled in other physics and this project will exploit.
MetaMat 28th webinar: Non-Hermitian elastodynamics without gain and loss
Relevant publications
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Christensen, J., Haberman, R. M., Srivastava, A., Huang, G., Shmuel, G., Perspective of non-Hermitian elastodynamics, (PDF), Appl. Phys. Lett. 125, 230501
- Fishman, A., Elbaz, G., Varma, T. V., Shmuel, G., Third‑Order Exceptional Points and Frozen Modes in planar Elastic Laminates, (PDF), J. Mech. Phys. Solids, 186, 105590, 2024
- Goldstein, T., Shmuel, G., Oblique scattering from non-Hermitian optical waveguides, (open access PDF), Phys. Rev. A, 107, 023503, 2023
- Elbaz, G., Pick, A., Moiseyev, N., Shmuel, G., Encircling exceptional points of Bloch waves: mode conversion and anomalous scattering (PDF), J. Phys. D: Appl. Phys. 55 235301, 2022
- Shmuel, G., Moiseyev, N., Linking scalar elastodynamics and non-Hermitian quantum mechanics (PDF), Phys. Rev. Applied, 13 (2), 024074, 2020
- Lustig, B., Elbaz, G., Muhafra, A., Shmuel, G., Anomalous energy transport in Laminates with exceptional points (PDF), J. Mech. Phys. Solids., 133, 103719, 2019