In-phase motion of Josephson vortices in stacked SNS Josephson junctions: effect of ordered pinning

Berdiyorov, Golibjon; Savel’ev, Sergey; Kusmartsev, F. V.; Peeters, F. M.

doi:10.1088/0953-2048/26/12/125010

Cited by 7 publications

(6 citation statements)

References 56 publications

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“…Distribution of magnetic fluxes in the Josephson junction gives the important information of Josephson vortices, and is one of the main subjects of studies of the Josephson effect [19,20,21,22,23,24]. For the vortex-vortex interaction in the frustrated case, a remarkable consequence of the change of vacuum structure can be seen in the magnetic flux:…”

Section: Ground Statementioning

confidence: 99%

“…The dynamics of Josephson vortices can be described by the sine-Gordon model [14,15,16,17,18]. On the other hand, studies of the vortices in various complex setups are frequently done by using the simulations of the Ginzburg-Landau (GL) model: 3D GL calculation in anisotropic mesoscopic superconductors [19], vortex-antivortex pair generation in the presence of applied electric current [20], time-dependent calculation of the vortices under an external source [21,22,23,24], and so on. Josephson vortex is not a mere conceptual object in theoretical physics, but a detectable one: it is directly observed by using scanning tunneling microscopy on the surface of Si(111)-( √ 7 × √ 3)-In [25] and in a lateral superconductor-normal-superconductor (SNS) network of superconducting Pb nanocrystals linked together by an atomically thin Pb wetting layer [26].…”

Section: Introductionmentioning

confidence: 99%

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Field theoretical model of multilayered Josephson junction and dynamics of Josephson vortices

Fujimori¹,

Iida²,

Nitta³

2016

Phys. Rev. B

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Multilayered Josephson junctions are modeled in the context of a field theory, and dynamics of Josephson vortices trapped inside insulators are studied. Starting from a theory consisting of complex and real scalar fields coupled to a U(1) gauge field which admit parallel N − 1 domain-wall solutions, Josephson couplings are introduced weakly between the complex scalar fields. The N − 1 domain walls behave as insulators separating N superconductors, where one of the complex scalar fields has a gap. We construct the effective Lagrangian on the domain walls, which reduces to a coupled sine-Gordon model for well-separated walls and contains more interactions for walls at short distance. We then construct sine-Gordon solitons emerging in an effective theory in which we identify Josephson vortices carrying singly quantized magnetic fluxes. When two neighboring superconductors tend to have the same phase, the ground state does not change with the positions of domain walls (the width of superconductors). On the other hand, when two neighboring superconductors tend to have π -phase differences, the ground state has a phase transition depending on the positions of domain walls; when the two walls are close to each other (one superconductor is thin), frustration occurs because of the coupling between the two superconductors besides the thin superconductor. Focusing on the case of three superconductors separated by two insulators, we find for the former case that the interaction between two Josephson vortices on different insulators changes its nature, i.e., attractive or repulsive, depending on the positions of the domain walls. In the latter case, there emerges fractional Josephson vortices when two degenerate ground states appear due to spontaneous charge-symmetry breaking, and the number of the Josephson vortices varies with the position of the domain walls. Our predictions should be verified in multilayered Josephson junctions.

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Section: Ground Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Field theoretical model of multilayered Josephson junction and dynamics of Josephson vortices

Fujimori¹,

Iida²,

Nitta³

2016

Phys. Rev. B

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“…In recent years, considerable efforts have been devoted to the study of the dynamics of Josephson vortices (fluxons) in stacks of Josephson junctions (JJs) [1][2][3][4][5][6][7][8][9][10][11][12][13]. This is, e.g., motivated by its potential to use such Josephson systems for creating high-frequency electromagnetic oscillations (see Refs.…”

Section: Introductionmentioning

confidence: 99%

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

et al. 2015

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Abstract.We use the anisotropic time-dependent Ginzburg-Landau theory to investigate the effect of a square array of out-of-plane magnetic dots on the dynamics of Josephson vortices (fluxons) in artificial stacks of superconducting-normal-superconducting (SNS) Josephson junctions in the presence of external DC and AC currents. Periodic pinning due to the magnetic dots distorts the triangular lattice of fluxons and results in the appearance of commensurability features in the current-voltage characteristics of the system. For the larger values of the magnetization, additional peaks appear in the voltage-time characteristics of the system due to the creation and annihilation of vortex-antivortex pairs. Peculiar changes in the response of the system to the applied current is found resulting in a "superradiant" vortex-flow state at large current values, where a rectangular lattice of moving vortices is formed. Synchronizing the motion of fluxons by adding a small ac component to the biasing dc current is realized. However, we found that synchronization becomes difficult for large magnetization of the dots due to the formation of vortex-antivortex pairs.

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“…In addition, nonlinear surface Josephson plasmon wave is predicted to exist in anisotropic layered superconductor and to exhibit fascinating electromagnetic effects 20 21 22 23 24 . Superconducting films or Josephson junction stacks patterned with a regular array of micron-scale holes has attracted much attention because the presence of holes has strong influence on the critical current, critical magnetic field and vortex motion in superconducting film 25 26 27 28 29 . In recent years, it is demonstrated that the enhanced THz transmission through arrays of subwavelength holes in superconducting films exhibit a unique tuning property 14 15 16 17 18 .…”

mentioning

confidence: 99%

The dynamic process and microscopic mechanism of extraordinary terahertz transmission through perforated superconducting films

Zhang

Jin

et al. 2015

Sci Rep

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Superconductor is a compelling plasmonic medium at terahertz frequencies owing to its intrinsic low Ohmic loss and good tuning property. However, the microscopic physics of the interaction between terahertz wave and superconducting plasmonic structures is still unknown. In this paper, we conducted experiments of the enhanced terahertz transmission through a series of superconducting NbN subwavelength hole arrays, and employed microscopic hybrid wave model in theoretical analysis of the role of hybrid waves in the enhanced transmission. The theoretical calculation provided a good match of experimental data. In particular, we obtained the following results. When the width of the holes is far below wavelength, the enhanced transmission is mainly caused by localized resonance around individual holes. On the contrary, when the holes are large, hybrid waves scattered by the array of holes dominate the extraordinary transmission. The surface plasmon polaritions are proved to be launched on the surface of superconducting film and the excitation efficiency increases when the temperature approaches critical temperature and the working frequency goes near energy gap frequency. This work will enrich our knowledge on the microscopic physics of extraordinary optical transmission at terahertz frequencies and contribute to developing terahertz plasmonic devices.

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In-phase motion of Josephson vortices in stacked SNS Josephson junctions: effect of ordered pinning

Cited by 7 publications

References 56 publications

Field theoretical model of multilayered Josephson junction and dynamics of Josephson vortices

Field theoretical model of multilayered Josephson junction and dynamics of Josephson vortices

Effect of ordered array of magnetic dots on the dynamics of Josephson vortices in stacked SNS Josephson junctions under DC and AC current

The dynamic process and microscopic mechanism of extraordinary terahertz transmission through perforated superconducting films

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