Amplitude Oscillations of the Resonant Phenomena in a Frenkel?Kontorova Model with an Incommensurate Structure

摘要: Dynamical mode locking phenomena in incommensurate structures of the dc- and ac-driven overdamped Frenkel—Kontorova model are studied by molecular-dynamics simulations. It is found that Shapiro steps exhibit significantly different amplitude frequency dependences from ones observed commensurate structures. The step widths still oscillate with amplitude, but form no longer Bessel-like, i.e., anomaly appears our same type anomalies also exhibited critical depinning force. oscillatory behavior revealed (, Fac) phase diagram where three phases observed. These oscillations directly correlated existence stability interference real systems.