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 …

Phononic crystals (PnCs) control the transport of sound and heat similar to the control of
electric currents by semiconductors and metals or light by photonic crystals. Basic and …

Owing to a steep rise in urban population, there has been a continuous growth in
construction of buildings, public or private transport like cars, motorbikes, trains, and planes …

Topological acoustic interface states in one-dimensional (1D) acoustic topological insulators
(ATIs) are zero-dimensional (0D) topological states localized at an interface. Unlike …

As an analog of topological insulators in acoustics, acoustic topological insulators possess
the pseudospin-dependent one-way transmission of sound edge states immune to …

Topological metamaterials offer new routes for control of waves, which are widely realized
by Bragg scattering and/or local resonance. Understanding of topological transition by the …

The topology concept in the condensed physics and acoustics is introduced into the elastic
wave metamaterial plate, which can show the topological property of the flexural wave. The …

The potential value of acoustic topological insulators is of wide interest because of their
special topology-protected edge-state unidirectional transmission properties. In this article, a …

In this paper, we propose a topological acoustic waveguide which can transmit high-
precision and multiband sound energy with backscattering suppression and no energy loss …

The intriguing discoveries of quantum spin Hall effect of electrons and its analogy in photon
systems have renovated several concepts in condensed matter physics. Here we emulate …