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

Recent discoveries of Mott insulating and unconventional superconducting states in twisted
bilayer graphene with moiré superlattices have not only reshaped the landscape of …

Over the past decade, topology has emerged as a major branch in broad areas of physics,
from atomic lattices to condensed matter. In particular, topology has received significant …

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 …

Acoustic metamaterials (AMs), which are materials composed of subwavelength periodic
artificial structures with specific designs, have drawn significant research attention. This is …

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

A quadrupole topological insulator, being one higher-order topological insulator with
nontrivial quadrupole quantization, has been intensely investigated very recently. However …

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 …