Synchronized dynamics of Josephson vortices in artificial stacks of SNS Josephson junctions under both dc and ac bias currents

Golibjon Berdiyorov, S. E. Savel'Ev, M. V. Milošević, F. V. Kusmartsev, F. M. Peeters

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Nonlinear dynamics of Josephson vortices (fluxons) in artificial stacks of superconducting-normal-superconducting Josephson junctions under simultaneously applied time-periodic ac and constant biasing dc currents is studied using the time dependent Ginzburg-Landau formalism with a Lawrence-Doniach extension. At zero external magnetic field and dc biasing current the resistive state of the system is characterized by periodic nucleation and annihilation of fluxon-antifluxon pairs, relative positions of which are determined by the state of neighboring junctions. Due to the mutual repulsive interaction, fluxons in different junctions move out of phase. Their collective motion can be synchronized by adding a small ac component to the biasing dc current. Coherent motion of fluxons is observed for a broad frequency range of the applied drive. In the coherent state the maximal output voltage, which is proportional to the number of junctions in the stack, is observed near the characteristic frequency of the system determined by the crossing of the fluxons across the sample. However, in this frequency range the dynamically synchronized state has an alternative - a less ordered state with smaller amplitude of the output voltage. Collective behavior of the junctions is strongly affected by the sloped sidewalls of the stack. Synchronization is observed only for weakly trapezoidal cross sections, whereas irregular motion of fluxons is observed for larger slopes of the sample edge.

Original languageEnglish
Article number184510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number18
DOIs
Publication statusPublished - 28 May 2013
Externally publishedYes

Fingerprint

Bias currents
Josephson junctions
Vortex flow
vortices
Electric potential
Synchronization
Nucleation
frequency ranges
Magnetic fields
output
electric potential
synchronism
nucleation
slopes
formalism
cross sections
magnetic fields
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Synchronized dynamics of Josephson vortices in artificial stacks of SNS Josephson junctions under both dc and ac bias currents. / Berdiyorov, Golibjon; Savel'Ev, S. E.; Milošević, M. V.; Kusmartsev, F. V.; Peeters, F. M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 18, 184510, 28.05.2013.

Research output: Contribution to journalArticle

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