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

闫彦宗; 王苍龙; 邵志刚; 杨磊

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

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

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《中国物理快报：英文版》 |2012年第6期|68-71|共4页
作者
闫彦宗; 王苍龙; 邵志刚; 杨磊;
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作者单位

College of Mathematics and Statistics;

Longdong University;

Qingyang 745000;

Institute of Modern Physics;

Chinese Academy of Sciences;

Lanzhou 730000;

College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of NWNU&IMP CAS;

Northwest Normal University;

Lanzhou 730070;

Laboratary of Quantum Information Technology;

Institute of Condensed Matter Physics;

School of Physics and Telecommunication Engineering;

South China Normal University;

Guangzhou 510006;

Department of Physics;

Lanzhou University;

Lanzhou 730000;

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原文格式 PDF
正文语种 chi
中图分类数学分析;
关键词
force; steps; commensurate;

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

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