Regensburg 2002 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.49: Poster

Donnerstag, 14. März 2002, 15:30–18:00, D

Dynamics of two fluxons in annular Josephson junction — •Abdufarrukh Abdumalikov¹, Boris Malomed², and Alexey Ustinov¹ — ¹Physikalisches Institut III, Universitaet Erlangen-Nuernberg, Erwin-Rommel-str.1, 91058 Erlangen, Germany — ²Department of applied Mathematics, School of Mathematical Sciences, Raymond and Beverly Faculty of Exact Sciences, Tel-Aviv University, Ramat-Aviv 69978, Israel

Magnetic flux quanta fluxons in superconducting Josephson junctions are well known examples of solitons. The dynamics of two fluxon in an annular Josephson junction in the presence of the external magnetic field is studied analytically, numerically and experimentally. We find an expression for the interaction potential between fluxons at arbitrary velocity. Assuming that the fluxons are quasi-particles, we derive equations for fluxon motion taking into account the interaction term. The numerical simulations of perturbed sine-Gordon equation and results obtained using our model are in good agreement in appropriate range of parameters. The experimental data well agree with the numerical results.