Regensburg 2002 – wissenschaftliches Programm
DY 46.50: Poster
Donnerstag, 14. März 2002, 15:30–18:00, D
Breathers in Josephson junction ladders: resonances and spectroscopy — •Andrey Miroshnichenko1, Flach Sergej1, Fistul Mikhail1, Zolotaryuk Yaroslav2, and Page John3 — 1Max-Planck-Institut fuer Physik komplexer Systems, Noethnitzer Str. 38, 01187 Dresden — 2Department of Mathematical Modelling, Technical University of Denmark, Building 321, Richard Petersens Plads, DK-2800 Kgs. Lyngby, Denmark — 3Department of Physics and Astronomy, Arizona State University Tempe, AZ 85287-1504, Arizona, USA
We present a study of the resonant interaction between dynamical localized states (discrete breathers) and linear electromagnetic excitations (EEs) in Josephson junction ladders. By making use of direct numerical simulations we obtain that such an interaction manifests itself by resonant steps and various sharp switchings (voltage jumps) in the current-voltage characteristics. Moreover, the power of ac oscillations away from the breather center (the breather tail) displays singularities as the externally applied dc bias decreases. All these features can be mapped to the spectrum of EEs that has been derived analytically and numerically. Using an improved analysis of the breather tail a spectroscopy of the EEs is developed. The nature of breather instability driven by localized EEs is established.