Inspired by the quantum spin Hall effect shown by topological insulators, wepropose a plate structure that can be used to demonstrate the pseudo-spin Halleffect for flexural waves. The system consists of a thin plate withperiodically arranged resonators mounted on its top surface. We extend atechnique based on the plane wave expansion method to identify a double Diraccone in such a locally resonant plate structure and to realize topologicaleffects at a subwavelength scale. Building on this method, we verifynumerically that this topological plate structure not only guides low-frequencyflexural waves robustly along a desired path, but also imparts a unique one-waypropagation characteristic to them.
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