Modeling of second sound in carbon nanostructures

The study of thermal transport in low-dimensional materials has attracted a lot attention recently after discovery high conductivity graphene. Here we numerically phonon carbon structures being interested the hydrodynamic regime revealed through observation second sound. We demonstrate that correct numerical modeling such two-dimensional systems requires semi-classical molecular dynamics simulations temperature waves take into account quantum statistics thermalized phonons. reveal sound can be attributed to maximum group velocity bending optical oscillations structures, and effects disappear for $T>200$K, replaced by diffusive waves. Our results suggest is about 6 km/s, are manifested stronger nanotubes rather than nanoribbons.