Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2011-07-13
J. Phys.: Condens. Matter 21 264002 (2009)
Nonlinear Sciences
Chaotic Dynamics
Scientific paper
10.1088/0953-8984/21/26/264002
Chaotic internal degrees of freedom of a molecule can act as noise and affect the diffusion of the molecule on a substrate. A separation of time scales between the fast internal dynamics and the slow motion of the centre of mass on the substrate makes it possible to directly link chaos to diffusion. We discuss the conditions under which this is possible, and show that in simple atomistic models with pair-wise harmonic potentials, strong chaos can arise through the geometry. Using molecular-dynamics simulations, we demonstrate that a realistic model of benzene is indeed chaotic, and that the internal chaos affects the diffusion on a graphite substrate.
de Wijn Astrid S.
Fasolino Annalisa
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