Elastic topological interface states and voltage feeder by breaking inversion symmetry on thin plates

The rapid progress in the engineering of topological edge/interface states has attracted considerable interest in both photonic and phononic systems originating from their electronic equivalent systems. However, most classical wave types, such as electromagnetic/acoustic waves in topological engineering, are described by two-dimensional (2D) partial differential equations (PDEs), which are not suitable for thin plate motions. We present a 1D elastic topological interface state induced by symmetry breaking to bridge a knowledge gap in 4D PDE, particularly for flexural waves on thin-plate frameworks. We also leverage the localized state at the interface for energy harvesting, which can provide a sufficiently high voltage feeder by piezoelectric effects.