Kinks motion and underdamped dc-driven dynamics of atomic monolayers

A multi-step dynamical phase transition from the locked to the running state of atoms in response to a dc external force is studied by molecular dynamics simulations of the generalized Frenkel-Kontorova models in the underdamped limit. We show that the hierarchy of depinning transition recently repo...

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Bibliographic Details
Published in:Physica. D 1998, Vol.123 (1), p.357-367
Main Authors: Braun, Oleg, Dauxois, Thierry, Paliy, Maxim, Peyrard, Michel, Hu, Bambi
Format: Article
Language:English
Subjects:
Frenkel-Kontorova model
Kinks
Surface diffusion
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Summary:A multi-step dynamical phase transition from the locked to the running state of atoms in response to a dc external force is studied by molecular dynamics simulations of the generalized Frenkel-Kontorova models in the underdamped limit. We show that the hierarchy of depinning transition recently reported [Braun et al., Phys. Rev. Lett. 78 (1997) 1295] strongly depends on the friction. In the present study we consider (i) a generalized FK model with highly anisotropic quasi-one-dimensional rectangular potential, and (ii) an isotropic triangular system, where the interactions between neighboring “channels” play an important role in the dynamics.
ISSN:0167-2789
1872-8022
DOI:10.1016/S0167-2789(98)00134-1