Rotational symmetry is shown to protect the quadratic dispersion of out-of-plane flexural vibrations in graphene and other two-dimensional materials against phonon–phonon interactions, making the bending rigidity of these materials non-divergent. The quadratic dispersion is then consistent with the propagation of sound in the graphene plane.

中文翻译：

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旋转对称性影响石墨烯的力学性能

旋转对称性被证明可以保护石墨烯和其他二维材料中面外弯曲振动的二次色散免受声子-声子相互作用的影响，从而使这些材料的弯曲刚度不发散。二次色散与石墨烯平面中的声音传播一致。