Nonlinear dynamics of dimers on periodic substrates

Details Nonlinear dynamics of dimers on periodic substrates Nonlinear dynamics of dimers on periodic substrates

2003-01-20

arxiv.org/abs/cond-mat/0301357v1

Eur. Phys. J. B 31, 95 (2003)

Physics

Condensed Matter

9 pages, 13 figures, to be published in Eur. Phys. J. B

Scientific paper

10.1140/epjb/e2003-00013-y

We study the dynamics of a dimer moving on a periodic one-dimensional substrate as a function of the initial kinetic energy at zero temperature. The aim is to describe, in a simplified picture, the microscopic dynamics of diatomic molecules on periodic surfaces, which is of importance for thin film formation and crystal growth. We find a complex behaviour, characterized by a variety of dynamical regimes, namely oscillatory, ``quasi-diffusive'' (chaotic) and drift motion. Parametrically resonant excitations of internal vibrations can be induced both by oscillatory and drift motion of the centre of mass. For weakly bound dimers a chaotic regime is found for a whole range of velocities between two non-chaotic phases at low and high kinetic energy. The chaotic features have been monitored by studying the Lyapunov exponents and the power spectra. Moreover, for a short-range interaction, the dimer can dissociate due to the parametric excitation of the internal motion.

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