Chaotic Dynamics of a Josephson Junction with a Ratchet Potential and Current-Modulating Damping

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Abstract

The chaotic dynamics of a Josephson junction with a ratchet potential and current-modulating damping are studied. Under the first-order approximation, we construct the general solution of the first-order equation whose boundedness condition contains the famous Melnikov chaotic criterion. Based on the general solution, the incomputability and unpredictability of the system’s chaotic behavior are discussed. For the case beyond perturbation conditions, the evolution of stroboscopic Poincaré sections shows that the system undergoes a quasi-periodic transition to chaos with an increasing intensity of the rf-current. Through a suitable feedback controlling strategy, the chaos can be effectively suppressed and the intensity of the controller can vary in a large range. It is also found that the current between the two separated superconductors increases monotonously in some specific parameter spaces.

Keywords

Josephson junction Ratchet potential Melnikov function Chaos 

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Copyright information

© Sociedade Brasileira de Física 2018

Authors and Affiliations

  1. 1.Department of Science EducationHunan First Normal UniversityChangshaChina

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