Acoustic and double elastic shock waves in single-crystal graphene

XJ Long and Y Cai and WR Jian and L Wang and SN Luo, JOURNAL OF APPLIED PHYSICS, 127, 055101 (2020).

DOI: 10.1063/1.5132925

Double elastic shock waves are rarely observed in two-dimensional (2D) materials and normally unexpected for elastically isotropic 2D crystals such as graphene. With large-scale molecular dynamics simulations, we show that in single-crystal graphene shock-loaded along nonzigzag and nonarmchair directions, double elastic shock waves (quasilongitudinal and quasitransverse) can emerge. Quantitative acoustic wave equation analysis reveals that shock-induced symmetry reduction in lattice, as well as in elastic stiffness tensor, gives rise to the normally unexpected quasitransverse wave following the quasilongitudinal wave.

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