Phononic crystals (PnCs) control the transport of sound and heat similar to the control of
electric currents by semiconductors and metals or light by photonic crystals. Basic and …

In solid state physics, a bandgap (BG) refers to a range of energies where no electronic
states can exist. This concept was extended to classical waves, spawning the entire fields of …

Materials made from active, living, or robotic components can display emergent properties
arising from local sensing and computation. Here, we realize a freestanding active …

Solids built out of active components can exhibit nonreciprocal elastic coefficients that give
rise to non-Hermitian wave phenomena. Here, we investigate non-Hermitian effects present …

Willis materials exhibit macroscopic cross-coupling between particle velocity and stress as
well as momentum and strain. However, Willis coupling coefficients designed so far are …

Metamaterials are man-made substances with unique spatial alternations in their constituent
components. They are widely used in modifying elastic, acoustic, or electromagnetic …

Breaking reciprocity with spatiotemporal modulation provides an opportunity to design
unprecedented optical, acoustic, and mechanical waveguides. A main challenge is to …

Vibration suppression at subwavelength scales is of great interest in acoustic and/or elastic
metamaterial engineering which has a wide range of potential applications requiring …

Real-time engineering of elastic rays in solid materials is crucial for several applications
relevant to active noise and vibration cancellation and to inverse methods aiming to either …

Elastic metamaterials (EMMs) encompass a relatively new class of composite materials that
exhibit unique dynamic effective material properties and possess the ability to mitigate or …