Demonstration of a third-order hierarchy of topological states in a three-dimensional acoustic metamaterial
Demonstration of a third-order hierarchy of topological states in a three-dimensional acoustic metamaterial
Classical wave systems have constituted an excellent platform for emulating complex quantum phenomena, such as demonstrating topological phenomena in photonics and acoustics. Recently, a new class of topological states localized in more than one dimension of a D-dimensional system, referred to as higher-order topological (HOT) states, has been reported, offering …