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Microwave-induced flow of vortices in long Josephson junctions

Barkov, F. L.; Fistul, M. V.; Ustinov, A. V.

Abstract (englisch):

We report an experimental and numerical study of microwave-induced flow of vortices in long Josephson junctions at zero dc magnetic field. Our intriguing observation is that applying an ac bias of a small frequency $f⪡{f}_{p}$ and sufficiently large amplitude changes the current-voltage characteristics ($I-V$ curve) of the junction in a way similar to the effect of dc magnetic field, well known as the flux-flow behavior. The characteristic voltage $V$ of this low voltage branch increases with the power $P$ of microwave radiation as ${V}_{s}{\propto}{P}^{{\alpha}}$ with the index ${\alpha}{\simeq}0.5$. Experiments using a low-temperature laser scanning microscope unambiguously indicate the motion of Josephson vortices driven by microwaves. Numerical simulations agree with the experimental data and show strongly irregular vortex motion. We explain our results by exploiting an analogy between the microwave-induced vortex flow in long Josephson junctions and incoherent multiphoton absorption in small Josephson junctions in the presence of large thermal fluctuations. In the case of long Josephson junctions the spatially temporal chaos in the vortex motion mimics the thermal fluctuations. ... mehr

DOI: 10.1103/PhysRevB.70.134515
Zitationen: 10
Zitationen: 8
Zugehörige Institution(en) am KIT Physikalisches Institut (PHI)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2004
Sprache Englisch
Identifikator ISSN: 0163-1829, 0556-2805, 1094-1622, 1095-3795, 1098-0121, 1550-235X, 2469-9950, 2469-9969
KITopen-ID: 1000074296
Erschienen in Physical review / B
Verlag American Physical Society (APS)
Band 70
Heft 13
Seiten 134515-1-134515-7
Nachgewiesen in Dimensions
Web of Science
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