EPL

Issue		Europhys. Lett. Volume 36, Number 7, December 1996
Page(s)		539 - 544
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		10.1209/epl/i1996-00266-0

Intrinsic localisation in the dynamics of aJosephson-junction ladder DOI: 10.1209/epl/i1996-00266-0

Europhys. Lett, 36 (7), pp. 539-544 (1996)

Intrinsic localisation in the dynamics of aJosephson-junction ladder

L. M. Floría , J. L. Marín , P. J. Martínez , F. Falo and S. Aubry

Departamento de Física de la Materia Condensada, Instituto de Ciencia de Materiales de Aragón, CSIC, Universidad de Zaragoza - 50009 Zaragoza, Spain
Laboratoire Léon Brillouin (CEA-CNRS), CE Saclay, 91191 Gif-sur-Yvette Cedex, France

(received 13 June 1996; accepted in final form 22 October 1996)

PACS. 74.50 - Proximity effects, weak links, tunneling phenomena, and Josephson effects.
PACS. 03.20 - Classical mechanics of discrete systems: general mathematical aspects.
PACS. 85.25Cp - Josephson devices.

Abstract:

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.

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