Abstract
The effects of both the ac and the dc external driving forces on the production of screw dislocations are studied by employing the two-dimensional Frenkel–Kontorova model. The ac force is introduced in the model as a way to describe external periodic disturbances or artificial periodic forces. We find that the appearance of the screw dislocation is influenced by the frequency and amplitude of the ac force. It is shown that the screw dislocation can be easily produced by either the lower frequency or the larger amplitude of the ac force.
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