Dynamics of short one-dimensional nonlinear thermostated atomic chains

The dynamics of short 1D nonlinear Hamiltonian chains is analyzed numerically at different temperatures (energy per particle). The boundary temperature $T_b$ separating the regular (quasiperiodic) and the stochastic (chaotic) chain motion is found. The dynamical properties of short 1D nonlinear chains interacting with thermostats are studied. It is shown that, in spite of the fluctuations, the dynamics of such systems can be stochastic as well as regular. The boundary temperature of these systems is close to that of the Hamiltonian one.