Model of coherent emission from disordered arrays of driven Josephson vortices

Marchesoni, F.; Savel’ev, Sergey; Nori, Franco

doi:10.1103/physrevb.81.174531

Cited by 9 publications

(5 citation statements)

References 50 publications

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“…This raises the question under what conditions JVs in layered superconductors emit coherent radiation. As has been recently shown in [141], the numerical results obtained in [59] could be attributed to the nonlocal (two scale) nature of JVs in layered superconductors. Let us now summarize the central idea of the approach reported in [141].…”

Section: Radiation Of Thz Waves In Layered Superconductorssupporting

confidence: 54%

“…As has been recently shown in [141], the numerical results obtained in [59] could be attributed to the nonlocal (two scale) nature of JVs in layered superconductors. Let us now summarize the central idea of the approach reported in [141]. Consider a moving JV lattice emitting radiation.…”

Section: Radiation Of Thz Waves In Layered Superconductorssupporting

confidence: 54%

“…Following [134], we choose the value of δq to eliminate the first harmonics (resonance terms containing cos( t ± q s x − kz − η)) on the right-hand side of equation (143). Substituting equation (141) into equation ( 143) we obtain…”

Section: Beyond Linear Approximation Now We Take Into Account the Non...mentioning

confidence: 99%

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Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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The recent growing interest in terahertz (THz) and sub-THz science and technology is due to its many important applications in physics, astronomy, chemistry, biology, and medicine, including THz imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental control, as well as chemical and biological identification. We review the problem of linear and nonlinear THz and sub-THz Josephson plasma waves in layered superconductors and their excitations produced by moving Josephson vortices. We start by discussing the coupled sine-Gordon equations for the gauge-invariant phase difference of the order parameter in the junctions, taking into account the effect of breaking the charge neutrality, and deriving the spectrum of Josephson plasma waves.We also review surface and waveguide Josephson plasma waves. The spectrum of these waves is presented, and their excitation is discussed. We review the propagation of weakly nonlinear Josephson plasma waves below the plasma frequency, ω J , which is very unusual for plasma-like excitations.In close analogy to nonlinear optics, these waves exhibit numerous remarkable features, including a self-focusing effect, and the pumping of weaker waves by a stronger one. In addition, an unusual stop-light phenomenon, when ∂ω/∂k ≈ 0, caused by both nonlinearity and dissipation, can be observed in the Josephson plasma waves. At frequencies above ω J , the current-phase nonlinearity can be used for transforming continuous sub-THz radiation into short, strongly amplified, pulses.We also present quantum effects in layered superconductors, specifically, the problem of quantum MQT -macroscopic quantum tunnelling.z-axis is directed across the layers; y-axis is directed along the magnetic field.4

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Section: Radiation Of Thz Waves In Layered Superconductorssupporting

confidence: 54%

Section: Radiation Of Thz Waves In Layered Superconductorssupporting

confidence: 54%

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Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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“…Such interest is partly due to the possibility of using such Josephson systems for the generation of high-frequency electromagnetic oscillations (see, e.g., [6]). Follow-up experimental [7,8] and theoretical [9][10][11][12] studies have shown that the moving fluxons can emit sub-terahertz electromagnetic radiation which can open a new avenue for creating tunable high-frequency radiation sources (see [13,14] for review). In order to generate noticeable radiation, oscillations induced by the moving lattice have to be in phase in the different layers, which is realized only when the moving vortices form a rectangular lattice, where the maximal emitted power is proportional to the square of the number of layers in the stack [15].…”

Section: Introductionmentioning

confidence: 99%

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

Berdiyorov¹,

Savel’ev²,

Kusmartsev³

et al. 2013

Supercond. Sci. Technol.

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The dynamics of Josephson vortices (fluxons) in artificial stacks of superconductingnormal-superconducting Josephson junctions is investigated using the anisotropic time-dependent Ginzburg-Landau theory in the presence of a square/rectangular array of pinning centers (holes). For small values of the applied drive, fluxons in different junctions move out of phase, forming a periodic triangular lattice. A rectangular lattice of moving fluxons is observed at larger currents, which is in agreement with previous theoretical predictions (Koshelev and Aranson 2000 Phys. Rev. Lett. 85 3938). This 'superradiant' flux-flow state is found to be stable in a wide region of applied current. The stability range of this ordered state is considerably larger than the one obtained for the pinning-free sample. Clear commensurability features are observed in the current-voltage characteristics of the system with pronounced peaks in the critical current at (fractional) matching fields. The effect of density and strength of the pinning centers on the stability of the rectangular fluxon lattice is discussed. Predicted synchronized motion of fluxons in the presence of ordered pinning can be detected experimentally using the rf response of the system, where enhancement of the Shapiro-like steps is expected due to the synchronization.

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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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Model of coherent emission from disordered arrays of driven Josephson vortices

Cited by 9 publications

References 50 publications

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

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

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

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