Experimental realization of acoustic logic gates based on valley-locked interface states in two-dimensional metamaterials

Abstract

Acoustic logic gates have recently garnered extensive attention for their potential in low-energy and high-efficiency information processing. However, their development still faces several critical challenges, including limited robustness, insufficient experimental validation, and restricted functional diversity. To address these issues, we design and demonstrate, both numerically and experimentally, an acoustic metamaterial platform based on valley-locked waveguides that supports a series of logic functions. The proposed metamaterial enables reliable realization of basic logic operations, including AND, OR, and XOR, within a certain frequency bandwidth, using a single configuration. For more complex logic functions, including NOR, XNOR, and NAND, flexible operation at any selected frequency within a specific bandwidth is achieved by introducing a bias input and combining two trident-shaped waveguides. Furthermore, the robustness of the proposed metamaterial systems is experimentally verified under the presence of structural defects, confirming the feasibility of valley-locked waveguides for logic implementation. These findings open new avenues for the development of reconfigurable and scalable acoustic computing architectures.