Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 10: Superconductivity - Tunneling, Josephson Junctions, SQUIDs

TT 10.5: Vortrag

Samstag, 5. März 2005, 09:30–09:45, TU H104

Discrete Breathers in Josephson Ladders — •Marcus Schuster and Alexey V. Ustinov — Physikalisches Institut III, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erwin-Rommel-Straße 1, 91058 Erlangen

We present an extensive study of intrinsic localized modes in ladder arrays of small underdamped Josephson junctions. These modes are time periodic localized dynamic states (named discrete breathers) which have recently been found in a large class of nonlinear lattices (see Ref. [1] for a review).

In experiments and numerical simulations, we investigate the spontaneous formation of intrinsic localized modes and their resonant interaction with linear oscillatory waves of the arrays. We furthermore study the propagation of the extended linear waves (Josephson plasmons) through the localized modes. Numerical simulations indicate the occurrence of a Fano resonance which arises from the time periodic scattering potential formed by the discrete breather. As a consequence, the resonant reflection of linear waves from the intrinsic localized mode is found.

[1] D. Campbell, S. Flach, and Y. S. Kivshar, Physics Today, January (2004), 43.