Nonadiabatic Shifting of a Topological Interface in an Electroacoustic Su-Schrieffer-Heeger Lattice

Abstract

We investigate numerical and experimental nonadiabatic relocation of a topological interface. We construct a reconfigurable electroacoustic Su-Schreiffer-Heeger lattice using negative-capacitance (NC) shunted piezoelectric patches attached to a host beam. Tuning the NC circuits allows us to create a topological-interface state by varying the effective elastic modulus along the beam. We then use a microcontroller to switch relays placed in the NC shunt circuits to move the interface by one unit cell. We present the results for continuous and pulse inputs and show the shift of energy localization in the experiment. Further, to distinguish topological protection, we simulate the nonadiabatic shifting of a trivial defect in a discrete lattice. Numerical simulations indicate higher mean energy at the interface after shifting a topological state as compared to a defect state. Topological interfaces as shown in our experiment may have interesting applications in acoustic communication, such as source switching and signal encoding.