Propagation of supersonic soliton in carbon nanotubes of armchair type

The propagation of a localized ring nonlinear wave in carbon nanotubes (CNTs) of armchair type has been explored using the MD/DFTB method. It is unambiguously shown that the considered localized waves are soliton- type. Herewith, the higher a velocity of an initial perturbation, the higher a steady-state velocity of the considered soliton. It is established that at a high initial excitation energy in a time period of 0.1–0.2 ps the soliton moves at the speed in the range of 245–270$\mathring{\mathrm{A}}$/ps, which is approximately in 1.22–1.35 times higher than the speed of sound in CNTs (200$\mathring{\mathrm{A}}$/ps). It is shown that the soliton velocity practically does not change with increasing CNT radius