The advancement in electromagnetic metamaterials, which commenced three decades ago,
experienced a rapid transformation into acoustic and elastic systems in the forms of …

We propose a perforated metastructure combining fish-belly panels and a corrugated
sandwich structure for broadband sound absorption. The curved panels provide a new …

Topological phononic crystals have attracted intensive attention due to their peculiar
topologically protected interface or edge states. Their operating frequency, however, is …

Ordered granular structures have garnered considerable attention across various fields due
to their capacity to manipulate the transmission of mechanical energy and mitigate the …

We present a reconfigurable electro-elastic topological insulator that produces a new valley
phase with a large Chern number. This piezoelectric metamaterial comprises a hexagon-like …

The band gap has been used to control the transmission features of acoustic/elastic waves.
Roton-like dispersion relations show that the energy and momentum of acoustic waves are …

This paper investigates the higher-order topological behavior of elastic wave metamaterials
composed of L-shaped pillars attached to a plate. In this system, the multi-dimensional …

The symmetric propagation of topological edge states in two-dimensional (2D) mechanical
systems cannot be directly applied to a one-dimensional (1D) system such as a beam. In this …

This paper reports the evidence of the tunable sub-wavelength topological interface state in
local resonance piezoelectric metamaterials. An elastic beam serves as the host medium …

In this work, we numerically investigate topological interface states for subwavelength in-
plane waves in elastic metamaterials composed mainly of translational resonators. The …