Double Dirac Cones and Topologically Non-Trivial Phonons for Continuous, Square Symmetric (C${}_{4v}$ and C${}_{2v}$) Unit Cells

Yan Lu, Harold S. Park

Because phononic topological insulators have primarily been studied in discrete, graphene-like structures with C${}_6$ or C${}_3$ hexagonal symmetry, an open question is how to sys…