Abstract:Topological phases in two-dimensional (2D) systems have been attracting tremendous attention since the discovery of graphene. Since the experimental probing could proceed in the whole phonon spectrum, intensive research effort has been devoted to the topological quantum phases in phononic systems. Via first-principles calculations, we predict that a family of 2D hexagonal materials, XH (X=Si, Ge, Sn), hosts ideal linear (LNP) and quadratic phononic nodal points (QNP). Specifically, the LNPs appear at the two ineq… Show more
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