Abstract
The response of charge-density-wave systems to the joint application of ac and dc electric fields is investigated within the phenomenological model proposed by Tua and Zawadowski. The model is solved numerically using a finite number N s of segments. Even if overdamped motion is assumed, the dc I–V characteristic shows harmonic as well as subharmonic steps with a devil's staircase structure, in contrast with the classical (single-particle) model with sinusoidal potential. The devil's staircase appears to be complete but no fractal dimension can be inferred. The structure of the staircase depends on N S and vanishes in the thermodynamic limit N S → ∞. The relevance of these results to the available experimental data is discussed.
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