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

For the classification of topological phases of matter, an important consideration is whether a
system is spinless or spinful, as these two classes have distinct symmetry algebra that gives …

Dirac cones (DCs) play a pivotal role in various unique phenomena ranging from massless
electrons in graphene to robust surface states in topological insulators (TIs). Recent studies …

Acoustic metamaterials (AMMs) are a type of artificial materials that make use of appropriate
structural designs and exhibit exotic properties not found in natural materials, such as …

Recently, there has been significant research interest in higher-order topological states
within artificial lattices, primarily due to their potential for manipulating waves. In this study …

The transport behaviors of topological guiding modes for classical waves in heterostructures
with width degree of freedom have attracted much attention recently. With the width degree …

Here we report the observation of the quadruple Weyl point of charge 4 in phononic crystals,
the highest topological charge a twofold degenerate node can carry. Besides the quadruple …

Backscattering immunity of valley edge states for a monolayer sonic crystal provides a basis
for designing devices with unconventional functions. Recently, the valley edge state of a …

We report the realization of an acoustic quadratic Weyl semimetal, which hosts a pair of
quadratic Weyl points with opposite charges±2 in the two lowest bands. The quadratic Weyl …