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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Transport and diffusion on crystalline surfaces under external forces

Focus on Brownian Motion and Diffusion in the 21st Century

Katja Lindenberg1, A M Lacasta1,2, J M Sancho1,3 and A H Romero1,4

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Part of Focus on Brownian Motion and Diffusion in the 21st Century

We present a numerical study of classical particles obeying a Langevin equation and moving on a solid crystalline surface under an external force that may either be constant or modulated by periodic oscillations. We focus on the particle drift velocity and diffusion. The roles of friction and equilibrium thermal fluctuations are studied for two nonlinear dynamical regimes corresponding to low and to high but finite friction. We identify a number of resonances and antiresonances, and provide phenomenological interpretations of the observed behaviour.


PACS

68.35.Fx Diffusion; interface formation

81.40.Pq Friction, lubrication, and wear

68.35.Gy Mechanical properties; surface strains

62.20.Qp Friction, tribology, and hardness

Subjects

Surfaces, interfaces and thin films

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (January 2005)

Received 24 September 2004

Published 31 January 2005



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