Fig. 2.

Nonthermal failure. (a) Computed breaking strain dependence on chiral angle. At lower points the structures are still stable, whereas the upper strains lead to fracture. Inset configurations (much shorter than the full computed structures) show the breaking-bond orientations. The thin line corresponds to Eq. 1 and reasonably describes the trend, whereas a higher-order extrapolation yields a better fit (thick line). (b) In the vicinity of breaking strain, the lattice trapped states could be identified corresponding to the shallow minima at a different number of broken bonds, as seen in the computed electronic density distribution, here (10,0) tube, n = 2, metastable at ε = 14.5%.