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 …

Emerging interest to synthesize active, engineered matter suggests a future where smart
material systems and structures operate autonomously around people, serving diverse roles …

Topological elastic metamaterials have emerged as a new frontier in the quest of topological
phases in condensed matter physics. Their exotic topological properties open a wealth of …

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 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 dynamics of topological boundary modes in both periodic and quasi-periodic
electromechanical metastructures is investigated, with a focus on their applications to …

So-called fragile topological states of matter challenge our conventional notion of topology
by lacking the robustness typically associated with topological protection, thereby displaying …

In this paper we report on adiabatic pumping in quasiperiodic stiffness-modulated beams.
We show that distinct topological states populating nontrivial gaps can nucleate avoided …

Recent years have seen the discovery of systems featuring fragile topological states. These
states of matter lack certain protection attributes typically associated with topology and are …

We report the concept and demonstration of a double-negative, resonant metamaterial
characterized by both dynamic negative mass and stiffness for negative refraction of flexural …