Dynamics of the overdamped three-layer model with the incommensurate structure

An overdamped three-layer model with incommensurate structure consisting of two harmonic chains which both move over the substrate potential is studied in the presence of an external [Formula omitted.] driving force. The force is applied only on the upper harmonic chain, and dynamics of the middle l...

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Bibliographic Details
Published in:Waves in random and complex media 2019-04, Vol.29 (2), p.236-246
Main Authors: Yang, Y., Tekić, Jasmina, Hong, X. R., Jia, L. P., Wei, P., Duan, W. S.
Format: Article
Language:English
Subjects:
Chain dynamics
Chain mobility
Chains
Locking
Phase diagrams
Substrates
Trajectory analysis
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Summary:An overdamped three-layer model with incommensurate structure consisting of two harmonic chains which both move over the substrate potential is studied in the presence of an external [Formula omitted.] driving force. The force is applied only on the upper harmonic chain, and dynamics of the middle layer is examined. The results show that the dynamical mode-locking appears not only in the upper layer but also in the middle one. The behavior of the middle layer is strongly determined by the amplitude and frequency of the ac force, and the phase diagram which presents pinned, dynamical mode-locking and sliding regimes as a function of system parameters are given. Contrary to the standard case, critical depinning force and steps exhibit anomalous behavior. Particles trajectories have been analyzed which showed very different motion of particles from the one which usually appears in systems under [Formula omitted.] forces.
ISSN:1745-5030
1745-5049
DOI:10.1080/17455030.2018.1428380