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 …

The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

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 …

The concept of topological energy bands and their manifestations have been demonstrated
in condensed matter systems as a fantastic paradigm toward unprecedented physical …

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 …

Topological mechanical metamaterials have emerged with the development of topological
phases and topological phase transitions in modern condensed matter physics. Their …

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

Energy in lower dimensions, such as edges or corners, can be robustly confined by the
higher-order topological insulators (HOTIs) against defects. Being promising for wave …

Topological insulators have attracted intensive attention due to their robust properties of
path defect immunity, with diverse applications in electromagnetic, acoustic, and elastic …

We amalgamate two fundamental designs from distinct areas of wave control in physics, and
place them in the setting of elasticity. Graded elastic metasurfaces, so-called metawedges …