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  • 1
    Electronic Resource
    Electronic Resource
    Long Josephson junctions with uniform dc and rf driving currents: General results for the phase-locked regimes (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2125-2130 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the dynamics of a long overlap Josephson junction in the presence of constant and sinusoidally time-varying currents on a finite-length spatial interval imposing open circuit boundary conditions at the ends. We scan the behavior of the system in parameter plane regions where the phase locking between the fluxon oscillations in the junction and the external time-varying field is possible. This scanning is performed for different values of the dc driving term and for lengths of the spatial interval ranging from 3.8 up to 15 and dissipation parameters ranging from 0.025 to 0.25. In spite of the complexity of the system and of the broad range of parameters investigated we find that the response to the rf excitation presents general features that can be well understood in terms of current-voltage characteristics of the junctions (and related experimental parameters). The results are compared with a recent theoretical model based on a perturbation approach of the sine-Gordon Hamiltonian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356298
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  • 2
    Electronic Resource
    Electronic Resource
    A vortex–antivortex pairs triggered Josephson shift register (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5053-5057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the performances of a type of single-phase shift register based on flux-quanta dynamics. The system employs as a clock signal a spatially localized sinusoidal current injection in a discrete Josephson transmission line. This drive generates fluxon–antifluxon pairs which, traveling along the transmission line, move the single flux quanta stored in attractive potential wells. These wells are obtained by inserting inductive discontinuities in the transmission line. The simulations show that the device could operate in real Josephson systems with clock frequencies in the range 10–100 GHz. Good margins are found for the most critical parameters of operation. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359733
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the capacitive coupling of Josephson transmission lines (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1772-1776 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the capacitive coupling of two long Josephson junctions by imposing appropriate boundary conditions at the ends of the junctions. Numerical simulations show good agreement with analytical estimates of the parameter range for which reflections of fluxons at the coupled end of the junction occur. We discuss our results in terms of recent experiments concerning phase-locking phenomena in Josephson junctions fluxon oscillators devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344368
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  • 4
    Electronic Resource
    Electronic Resource
    Phase lock of a long Josephson junction to an external microwave source (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 2581-2585 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A long Josephson junction dc biased on a zero-field singularity and emitting radiation at microwave frequencies is irradiated with external microwave power. This power can be supplied either by a room-temperature oscillator or by another long junction. We find that the oscillations of the junction can coherently lock to the external signal for frequency intervals ranging from 500 kHz to 50 MHz. The dependence of the width of these intervals of coherence on the external microwave power is measured for the case in which the power is generated by a room-temperature oscillator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337936
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  • 5
    Electronic Resource
    Electronic Resource
    Chaos and phase lock in long Josephson junctions (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 338-341 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of extensive digital simulations of a long Josephson junction subject to the presence of dc and rf driving currents are reported. The dynamic behavior of this system is mapped as a function of rf amplitude and frequency of the parameter set which leads to fluxon oscillations in the absence of an rf drive. In response of the rf excitation the junction is shown to exhibit a variety of behaviors including periodic motion in which the fluxon oscillation is phase locked to the rf frequency, chaotic motion in which spatial structure persists, and spatially uniform periodic and chaotic motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337649
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  • 6
    Electronic Resource
    Electronic Resource
    Phase-locking Josephson junctions arrays (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3570-3577 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We demonstrate that a large area Josephson junction oscillating in the fluxon oscillator mode can be synchronized to other large junctions and simultaneously pump, by emitted radiation, a small area junction. We study the synchronization of the oscillations of the long junctions as a function of relevant experimental parameters such as bias current and stripline coupling characteristics. Experimental results obtained on coupled series arrays of Josephson junctions designed on the basis of our calculations are presented. We have fabricated coupled arrays containing each up to 1500 junctions in order to estimate the usefulness of our calculations for voltage standard devices. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1402662
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  • 7
    Electronic Resource
    Electronic Resource
    Millimeter wave generation by fluxon oscillations in a Josephson junction (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2376-2380 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A small-area Josephson tunnel junction is pumped by the radiation emitted by a long Josephson junction dc biased on a zero-field singularity. Josephson constant voltage steps are observed in the current-voltage characteristic of the small junction at voltages of ±150 μV corresponding to the fundamental frequency of emission of the oscillator. The radiation also gives rise to quasiparticle steps around the gap-sum voltage of the small junction. From the measured current amplitude of the steps we estimate that the maximum power coupled to the small junction is about 90 nW.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342802
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  • 8
    Electronic Resource
    Electronic Resource
    Inductively coupled fluxon oscillators (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3217-3230 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study numerically the propagation of fluxons along two Josephson transmission lines which are coupled by an inductive element. This structure, for particular choices of the coupling parameters, reveals an interesting variety of nonlinear phenomena. The numerical simulations show good qualitative agreement with analytical calculations regarding the most significant events (reflection and transmission of fluxons). Experimental results obtained from real Josephson devices are also reported and the possible application of these devices is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335802
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  • 9
    Electronic Resource
    Electronic Resource
    Radiation detection from Fiske steps in Josephson junctions above 200 GHz (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 8637-8640 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the Josephson radiation emitted at millimeter-wave frequencies by a long Josephson junction dc-current biased on Fiske steps of the current-voltage characteristic. Our measurements demonstrate that differences between dynamic excitation generating Fiske steps and fluxon oscillations giving rise to zero-field steps in long junctions may exist. The radiation, whose maximum measured frequency is 240 GHz, is generated by an in-line junction and detected on a chip by a small planar tunnel junction. From measurements of Shapiro steps amplitude and photon-assisted tunneling steps we find that the coupled radiation has a power tunability of 350 nW and the maximum coupled power is 20 nW in a 30-Ω normal-state resistance tunnel junction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353396
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamics of a nonautonomous sine-Gordon system modeling long Josephson junctions (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5729-5734 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We study the dynamics of an ac and dc driven sine-Gordon system extending over a finite spatial interval. We use this system to model fluxon oscillations in long (one-dimensional) Josephson junctions in the presence of an rf current. For three different values of the normalized spatial interval, or junction length, and a fixed value of the loss parameter the response of the junction is scanned over wide regions of the (rf drive amplitude and frequency) plane. In these regions chaotic intermittency, quasiperiodicity and isochronous phase locking are the most interesting dynamical features. We investigate the range of isochronous phase-locking of the soliton oscillations to the external ac drive in parameter space regions where experimental verification of our data can be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346967
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