https://doi.org/10.1140/epjb/e20020083
Quasiperiodically driven Josephson junctions: strange nonchaotic attractors, symmetries and transport
Department of Physics, University of Potsdam, Am Neuen Palais,
PF 601553, 14415, Potsdam, Germany
Corresponding author: a eireen@stat.physik.uni-potsdam.de
Received:
16
August
2001
Revised:
22
January
2002
Published online: 15 March 2002
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.
PACS: 05.45.-a – Nonlinear dynamics and nonlinear dynamical systems / 85.25.Cp – Josephson devices / 74.80.Fp – Point contacts
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002
