Experimental Demonstration of Dynamic Topological Pumping Across Incommensurate Bilayered Acoustic Metamaterials

In this talk, we present a system of acoustic metamaterials generated by incommensurate bilayers with a phason degree of freedom. The system presents dynamic energy transfer in adiabatic cycles across the crystal via pumping of topological edge modes without any outside intervention or assistance. The system is characterized experimentally by standard acoustic measurements, and via a finite element approach utilizing COMSOL Multiphysics. The experimental results and simulations confirm the energy transfer via topological pumping process. This study suggests possible applications of electron pumping in conventional insulators.