SPONTANEOUSLY APPEARING DISCRETE MOVING KINKS IN NONLINEAR
ACOUSTIC CHAIN WITH REALISTIC POTENTIAL
Author(s): L.S.Metlov, Yu.V.Eremeichenkova (Donetsk Physico-Technical Institute, National Academy of Sciences of Ukraine, 72 R.Luxemburg Str., 83114 Donetsk, Ukraine)
Molecular dynamic simulations are performed to investigate a long-time evolution of different initial signals in nonlinear acoustic chains with realistic Exp-6 potential and with power potentials. First, in the chain with realistic potential, long-lifetime kink-shaped excitations are found in the system in thermodynamic equilibrium. They give sharp peaks on high-energy tile of Gibbs distribution. Travelling along the chain, each kink collects the energy from the background atoms, and, consequently, transfers it to small-amplitude phonons. Dynamic equilibrium is observed between the processes of growth and decay of the kinks.
Key words: moving kink, realistic potential, thermodynamic
equilibrium, energy concentration, Gibbs distribution
PACS: 63.20.Pw, 63.20.Ry, 65.90.+i
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