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Spontaneously appearing discrete moving kinks in nonlinear acoustic chain with realistic potential
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...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2003
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/120697 |
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| Summary: | 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 smallamplitude
phonons. Dynamic equilibrium is observed between the processes
of growth and decay of the kinks. |
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