CEEM Seminar | Gal Shmuel | Technion
Metamaterials with Electromomentum Coupling
Metamaterials are artificial composites designed to exhibit extraordinary effective properties, in value or in nature. Using homogenization, Willis developed metamaterials in elastodynamics with anomalous coupling between linear momentum and strain. We discovered an analogous coupling between linear momentum and electric field in piezoelectric composites, which we term the electromomentum coupling. This coupling provides a mechanism for wave manipulation similar to the Willis coupling, but with the added benefit of electrical tunability. I will outline the methods that led to this discovery, discuss its physical origins, illustrate its role in deriving physically meaningful effective models, and demonstrate its application in wavefront shaping.
Gal Shmuel
Gal Shmuel is an associate professor at the Faculty of Mechanical Engineering, Technion, Israel. Shmuel’s group studies the mechanics of active-, soft- and heterogeneous media. He is the 2021 ERC consolidators grant recipient for his current focus on metamaterials in elastodynamics. His recent contributions include the discovery of the electromomentum coupling in piezoelectric metamaterials, and more generally cross-coupling of Willis type in active composites; and the realization of exceptional points and non-Hermitian phenomena in conservative elastodynamics.