Topological acoustics is an emerging field that lies at the intersection of condensed matter
physics, mechanical structural design and acoustics engineering. It explores the design and …

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 …

Abstract In 1878, Lord Rayleigh observed the highly celebrated phenomenon of sound
waves that creep around the curved gallery of St Paul's Cathedral in London,. These …

The study of classical wave physics has been reinvigorated by incorporating the concept of
the geometric phase, which has its roots in optics, and topological notions that were …

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

Recently, we witnessed a tremendous effort to conquer the realm of acoustics as a possible
playground to test with topologically protected sound wave propagation. In this article, we …

Valley topological materials, in which electrons possess valley pseudospin, have attracted a
growing interest recently. The additional valley degree of freedom offers a great potential for …

Stable and efficient guided waves are essential for information transmission and processing.
Recently, topological valley-contrasting materials in condensed matter systems have been …

The extensive research of two-dimensional layered materials has revealed that valleys, as
energy extrema in momentum space, could offer a new degree of freedom for carrying …