Volume 36, Number 7, December I 1996
|Page(s)||539 - 544|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Intrinsic localisation in the dynamics of a Josephson-junction ladder
Departamento de Física de la Materia Condensada,
Instituto de Ciencia de Materiales de Aragón, CSIC, Universidad de
50009 Zaragoza, Spain
2 Laboratoire Léon Brillouin (CEA-CNRS), CE Saclay, 91191 Gif-sur-Yvette Cedex, France
Accepted: 22 October 1996
We investigate some aspects of the general problem of nonlinear effects on the operation of an anisotropic ladder of Josephson junctions with injected ac currents. We predict the existence of attracting time-periodic spatially localised modes, for some ranges of junction characteristic parameters. These elementary dynamical excitations are of two different types, associated to oscillatory and rotating motion of a few superconducting islands phases, respectively, revealing a dynamical mechanism of creation of vortex-antivortex pairs. These results are physical applications of recent advances in the theory of nonlinear dynamics of discrete macroscopic systems. Their experimental confirmation would probe the physical relevance of localisation in Josephson-junction devices.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 03.20.+i – Classical mechanics of discrete systems: general mathematical aspects / 85.25.Cp – Josephson devices
© EDP Sciences, 1996
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