Regensburg 2004 – scientific programme

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TT: Tiefe Temperaturen

TT 31: Supraleitung: Vortexdynamik, Vortexphasen, Pinning

TT 31.1: Talk

Friday, March 12, 2004, 10:15–10:30, H20

Vortex radiation in long Josephson nanojunctions — •A.A. Abdumalikov Jr.¹, M.V. Fistul¹, V.V. Kurin², and A.V. Ustinov¹ — ¹Physikalisches Institut III, Universität Erlangen-Nürnberg, Erwin-Rommel-str.1, 91058 Erlangen, Germany — ²Institute for Physics of Microstructure (RAS), Nizhniy Novgorod, Russia

We theoretically, numerically and experimentally investigate the dynamics of vortices in long submicron-wide Josephson junctions. Using a variational approach, the current voltage characteristics are calculated for various junction width and number of vortices trapped in the junction. The theoretical and numerically calculated current-voltage characteristics show good agreement. The maximum velocity of vortices is increasing with decreasing the junction width. Due to interaction with stray magnetic fields outside the junction, the vortices radiate Cherenkov waves as they move in the junction. Locking of the vortex oscillation frequency to that of the Cherenkov radiation leads to strong resonances on the current-voltage characteristics. We observe such resonances in experiment in qualitative agreement with our theoretical analysis.