Nanoscale spacecrafts have shed light on an audacious but promising vision for interstellar
travel to neighboring planets beyond the solar system. The nanocrafts can be accelerated to …

The combination of broken Hermiticity and band topology in physical systems unveils a
novel bound state dubbed as the non-Hermitian skin effect (NHSE). Active control that …

In this work, a review of mechanical metamaterials and seismic protection systems that use
them is carried out, focusing on passive protection systems. During the last years, a wide …

Based on the granular diatomic lattice chain model, the band gap properties and
nonreciprocal transmission of elastic wave metamaterials with the nonlinearity are studied …

Topological phases of matter, originally derived from condensed matter physics, have been
extensively exploited in photonics and phononics, and recently in mechanical metamaterial …

Higher-order topological insulators (HOTIs), an extended concept of traditional first-order
topological insulators, are capable of hosting multidimensional topological states and …

The confinement of waves within a waveguide can enable directional transmission of
signals, which has found wide applications in communication, imaging, and signal isolation …

The locally resonant band gaps that lie in the vicinity of resonant frequency have been
extensively employed in metamaterials for ultralow-frequency wave control, such as …

Metamaterials are designed and manufactured artificially to manifest intriguing physical
concepts and achieve unusual potential applications. However, the exotic properties of …

Negative thermal expansion is an interesting and appealing phenomenon for various
scientific and engineering applications, while rarely occurring in natural materials. Here …