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Backbending current-voltage characteristic for an annular Josephson junction in a magnetic field

Ustinov, Alexey V.; Malomed, Boris A.; Goldobin, Edward

Abstract:
Excitation of the Josephson plasma radiation by a fluxon moving in an annular Josephson junction is studied experimentally, numerically, and using an analytical approach. An externally applied magnetic field H forms a cosinelike potential relief for the fluxon in a ring-shaped junction. The motion of the fluxon in the junction leads to an emission of plasma waves, which give rise to a resonance at a certain fluxon velocity. The experimental data agree well with numerical simulations which indicate a locking of the fluxon to the radiation frequency. The peculiar feature indicated by both experiment and numerical simulations is the shape of the resonance in the current-voltage (I − V) characteristic which shows a clear backbending, with a negative differential resistance. The analytical approach developed in this work is based on the perturbation theory for radiation emission generated by a kink in the perturbed sine-Gordon equation. To explain the observed effect, we introduce an addition to the perturbation theory, which proves to be crucial for explanation of the backbending I − V curves: We take into account the fact that the background radiation field, supported by a balance between emission from the moving kink and dissipative absorption, narrows the junction’s plasma frequency gap. ... mehr

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Originalveröffentlichung
DOI: 10.1103/PhysRevB.60.1365
Scopus
Zitationen: 11
Web of Science
Zitationen: 9
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Jahr 1999
Sprache Englisch
Identifikator ISSN: 0163-1829, 1095-3795, 0556-2805, 1094-1622, 1098-0121, 1550-235X, 2469-9950, 2469-9969
KITopen-ID: 1000074491
Erschienen in Physical review / B
Band 60
Heft 2
Seiten 1365-1371
Nachgewiesen in Web of Science
Scopus
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