The law of reciprocity in acoustics and elastodynamics codifies a relation of symmetry
between action and reaction in fluids and solids. In its simplest form, it states that the …

Phononic crystals (PCs) and metamaterials (MMs) can exhibit abnormal properties, even far
beyond those found in nature, through artificial design of the topology or ordered structure of …

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 …

By employing periodic electrical boundary conditions, an innovative method to generate
actively tunable topologically protected interface mode in a “homogeneous” piezoelectric …

Abstract Space− time modulated metamaterials support extraordinary rich applications, such
as parametric amplification, frequency conversion, and non-reciprocal transmission. The …

We experimentally achieve wave-mode conversion and rainbow trapping in an elastic
waveguide loaded with an array of resonators. Rainbow trapping is a phenomenon that …

We experimentally demonstrate temporal pumping of elastic waves in an electromechanical
waveguide. Temporal pumping exploits a virtual dimension mapped to time, enabling the …

Space-time-varying materials pledge to deliver nonreciprocal dispersion in linear systems
by inducing an artificial momentum bias. Although such a paradigm eliminates the need for …

Guided waves, elastic waves propagating through bounded structures, play a pivotal role in
various applications, including ultrasonic non-destructive testing and structural health …

We investigate non-Hermitian elastic lattices characterized by non-local feedback
interactions. In one-dimensional lattices, proportional feedback produces non-reciprocity …