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 …

We present a theoretical study and experimental realization of a system that is
simultaneously a four-dimensional (4D) Chern insulator and a higher-order topological …

Synthesized three-dimensional space provides us with a platform to explore the intriguing
acoustic valley Hall insulator. In this paper, a rotational degree of freedom is introduced to …

The study of Weyl semimetals (WSs) has been attracting widely attention due to the fact that
the Weyl point (WP) and associated topological invariants enable WSs to exhibit a variety of …

Here, we propose the construction of acoustic Weyl semimetals in synthetic dimensions
based on a 2D coupling waveguide array under external dynamic modulations. The type-I …

Weyl semimetals, which are a class of materials, have attracted extensive attention in
condensed matter physics. In this letter, we report one-dimensional layered sonic crystals …

Valley degree of freedom has attracted great interest in the realization of topological edge
states in acoustic systems owing to its rich valley-contrasting physics and great potential …

Effective relativistic field theory models capable of realizing various gapless topological
states are presented in this work. We study the topological phase transitions of the Weyl and …

Effective field theory models capable of realizing various gapless topological states are
presented in this work. After reviewing the effective field models of the Weyl and nodal line …