Cherenkov radiation in coupled long Josephson junctions

Goldobin, E.; Wallraff, Andreas; Thyssen, N.; Ustinov, A. V.

doi:10.1103/physrevb.57.130

Cited by 76 publications

(70 citation statements)

References 20 publications

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“…Indeed, for these states the Cherenkov radiation tail is so long (ϳL), that our annular system cannot simulate an infinitely long system, resulting in Cherenkov resonances which inevitably appear in the system of a finite perimeter. 6,7 …”

Section: Three Coupled Junctionsmentioning

confidence: 99%

“…The results of our consideration can be applied to intrinsically layered HTS materials, 1 since the Josephson-stack model has proved to be appropriate for these structures. [2][3][4] In earlier papers [5][6][7][8] it was shown that, in some cases, a fluxon ͑Josephson vortex͒ moving in one of the layers of the stack may emit electromagnetic ͑plasma͒ waves by means of the Cherenkov mechanism. The fluxon together with its Cherenkov radiation has the profile of a traveling wave, (xϪut), having an oscillating gradually decaying tail.…”

Section: Introductionmentioning

confidence: 99%

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Bunching of fluxons by Cherenkov radiation in Josephson multilayers

2000

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A single magnetic fluxon moving at a high velocity in a Josephson multilayer ͑e.g., high-temperature superconductor such as BSCCO͒ can emit electromagnetic waves ͑Cherenkov radiation͒, which leads to the formation of stable dynamic states consisting of several bunched fluxons. We find such bunched states in numerical simulations in the simplest cases of two and three coupled junctions. At a given driving current, several different bunched states are stable and move at velocities that are higher than the corresponding single-fluxon velocity. These and some of the more complex higher-order bunched states and transitions between them are investigated in detail.

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Section: Three Coupled Junctionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bunching of fluxons by Cherenkov radiation in Josephson multilayers

2000

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“…The radiation should increase greatly if V exceeds the value of the phase velocity of the waves, which is referred to as Cherenkov-effect [55]. In particular, Cherenkov radiation arises [17,51,[56][57][58][59][60][61][62][63][64][65][66][67] in Josephson junctions if the vortex velocity V exceeds the phase velocity c w (q) of the waves with a definite wave-vector q.…”

Section: A Cherenkov Radiation From Moving Josephson Vorticesmentioning

confidence: 99%

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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“…7,[27][28][29] The stability of the bunched state for velocities v, where c Ϫ ϽvϽc ϩ , was investigated by means of perturbation analysis of the antiphase linear mode by Gro "nbech-Jensen et al 9,11,30 Numerical simulations showing the attraction between fluxons due to radiation emission in several junctions have been made. 6 The results concerning bunched dynamics of fluxons are summarized in Ref.…”

Section: ͑7͒mentioning

confidence: 99%