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    Elastic three-dimensional phononic topological insulators with Dirac hierarchy

    Three-dimensional (3D) phononic topological insulators (TIs) featuring two-dimensional (2D) surface states and one-dimensional (1D) hinge states have opened up a new route for multi-dimensional robust wave tra...

    Shao-Yong Huo, Qiu-Shuang Yang, Jiu-Jiu Chen in Science China Physics, Mechanics & Astrono… (2024)