Metamaterials are rationally designed man-made structures composed of functional building
blocks that are densely packed into an effective (crystalline) material. While metamaterials …

Understanding and controlling vibrations in condensed matter is emerging as an essential
necessity both at fundamental level and for the development of a broad variety of …

Negative refraction of elastic waves has been studied and experimentally demonstrated in
three-and two-dimensional phononic crystals, but Bragg scattering is impractical for low …

Negative refraction of elastic waves has attracted significant research interest due to its
potential prospects in acoustic imaging, communication, and structural health monitoring …

An elastic analog of graphene is introduced and analyzed. The system consists of a
honeycomb arrangement of spring-mass resonators attached to a thin elastic layer, and the …

Elastic waves in anisotropic media can exhibit a power flux that is not collinear with the wave
vector. This has notable consequences for waves guided in a plate. Through laser-ultrasonic …

This work presents a method for the realization of gradient index devices for flexural waves
in thin plates. Unlike recent approaches based on phononic crystals, the present approach …

We investigate the effect of structural periodicity on elastic longitudinal and flexural wave
propagation in parity-time (PT) symmetric prototypical elastic metamaterial rods and beams …

We report the changes in dispersion relations of hypersonic acoustic phonons in free-
standing silicon membranes as thin as∼ 8 nm. We observe a reduction of the phase and …

The roton-like dispersions support the “return flow” of acoustic waves; such phenomena
were only observed in quantum systems. In this paper, we aim to investigate the nonlinear …