Quasiperiodically driven Josephson junctions: strange nonchaotic attractors, symmetries and transport |
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Authors: | E Neumann A Pikovsky |
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Institution: | (1) Department of Physics, University of Potsdam, Am Neuen Palais, PF 601553, 14415, Potsdam, Germany, DE |
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Abstract: | We consider the dynamics of the overdamped Josephson junction under the influence of an external quasiperiodic driving field.
In dependence on parameter values either a quasiperiodic motion or a strange nochaotic attractor (SNA) can be observed. The
latter corresponds to a resistive state in the current-voltage characteristics while for quasiperiodic motion a finite superconducting
current exists for zero voltage. It is shown that in the case of SNA a nonzero mean voltage across the junction can appear
due to symmetry breakings. Based on this observation a detailed symmetry consideration of the generalized equation of motion
is performed and symmetry conditions ensuring zero mean voltage across the junction are found.
Received 16 August 2001 and Received in final form 22 January 2002 |
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Keywords: | PACS 05 45 -a Nonlinear dynamics and nonlinear dynamical systems – 85 25 Cp Josephson devices – 74 80 Fp Point contacts |
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