Abstract

In this letter, we present an elastic slow-wave waveguide, which utilizes and transports valley pseudospins in a two-dimensional plate phononic crystal (PnC). Both straight and bent waveguides are made for demonstrating the backscattering suppression of elastic edge-state transport due to valley-dependent pseudospins. By band structure engineering, elastic waves in a plate waveguide can be transported at ultralow velocities with considerable robustness, which is very promising for the generation of new solid-state phononic circuits with great versatility.

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