Magnetic field penetration in a long Josephson junction imbedded in a wide stripline

Franz, A; Wallraff, Andreas; Ustinov, A. V.

doi:10.1063/1.1325006

Cited by 21 publications

(21 citation statements)

References 22 publications

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“…I, it has been traditionally assumed that when the external field lays in the barrier plane ͑H z = 0 and H Ќ =0͒, it uniformly threads the oxide layer, so that H ʈ = H = H a ϵ͑H x , H y ͒. Today we know that this is only true to the first approximation for naked JTJs, since field focusing effects should to be considered in planar JTJ structures especially in the case of window junctions 20,21 that are surrounded by a passive thick oxide layer-the so-called idle region. 22 Our samples were designed to have the smallest possible idle region, so that field focusing effects could be neglected; consequently our theory has been developed under the simplifying assumption that the samples are naked.…”

Section: Theorymentioning

confidence: 99%

Static properties of small Josephson tunnel junctions in an oblique magnetic field

et al. 2009

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We have carried out a detailed experimental investigation of the static properties of planar Josephson tunnel junctions in presence of a uniform external magnetic field applied in an arbitrary orientation with respect to the barrier plane. We considered annular junctions, as well as rectangular junctions ͑having both overlap and cross-type geometries͒ with different barrier aspect ratios. It is shown how most of the experimental findings in an oblique field can be reproduced invoking the superposition principle to combine the classical behavior of electrically small junctions in an in-plane field together with the small junction behavior in a transverse field that we recently published ͓R. Monaco et al., J. Appl. Phys. 104, 023906 ͑2008͔͒. We show that the presence of a transverse field may have important consequences, which could be either voluntarily exploited in applications or present an unwanted perturbation.

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Section: Theorymentioning

confidence: 99%

Static properties of small Josephson tunnel junctions in an oblique magnetic field

et al. 2009

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“…The junctions were fabricated on different chips within the same run of a standard Nb-AlO x -Nb trilayer process 32 and had a critical-current density of J C = 1.2 kA/ cm 2 at temperature T = 1.4 K, which corresponds to a Josephson length of J =13 m ͑after including the effect of the idle region͒. 33 The basic shape of the junctions was annular with a radius of r =50 m and a width of w 0 = 2.4 m. A short length l = 1.4 m of each junction was wider, w = 2.9 m, forming a lithographic microshort of expected strength = 0.09. The junctions had Lyngby style 20 electrode leads, whose width slightly exceeds the junction diameter 2r.…”

Section: A Samples and Setupmentioning

confidence: 99%

Vortex qubit based on an annular Josephson junction containing a microshort

et al. 2010

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We report theoretical and experimental work on the development of a vortex qubit based on a microshort in an annular Josephson junction. The microshort creates a potential barrier for the vortex, which produces a double-well potential under the application of an in-plane magnetic field; The field strength tunes the barrier height. A one-dimensional model for this system is presented, from which we calculate the vortex depinning current and attempt frequency as well as the interwell coupling. Implementation of an effective microshort is achieved via a section of insulating barrier that is locally wider in the junction plane. Using a junction with this geometry we demonstrate classical state preparation and readout. The vortex is prepared in a given potential well by sending a series of "shaker" bias current pulses through the junction. Readout is accomplished by measuring the vortex depinning current.

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“…A possible explanation could be the influence of the idle region [110][111][112][113][114][115][116][117][118] which may have a stabilizing effect on the dynamics of FFO and, presumably, affect the values of MFFCs. Influence of the idle region on the dynamics of FFO has been neglected in our theoretical treatment (except for the renormalization of Josephson penetration length on which it has an effect [115,116]).…”

Section: Comparison To Experimental Resultsmentioning

confidence: 99%

Josephson flux-flow oscillator: The microscopic tunneling approach

2017

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Citation: GULEVICH, D.R., KOSHELETS, V.P. and KUSMARTSEV, F.V., 2017.Josephson flux-flow oscillator:The microscopic tunneling approach.Physical Review B, 96 (2), 024515-1 -024515-12.Additional Information:• We elaborate a theoretical description of large Josephson junctions which is based on Werthamer's microscopic tunneling theory. The model naturally incorporates coupling of electromagnetic radiation to the tunnel currents and, therefore, is particularly suitable for description of the self-coupling effect in Josephson junction. In our numerical calculations we treat the arising integro-differential equation, which describes temporal evolution of the superconducting phase difference coupled to the electromagnetic field, by the Odintsov-Semenov-Zorin algorithm. This allows us to avoid evaluation of the time integrals at each time step while taking into account all the memory effects. To validate the obtained microscopic model of large Josephson junction we focus our attention on the Josephson flux-flow oscillator. The proposed microscopic model of flux-flow oscillator does not involve the phenomenological damping parameter, rather the damping is taken into account naturally in the tunnel current amplitudes calculated at a given temperature. The theoretically calculated current-voltage characteristics is compared to our experimental results obtained for a set of fabricated flux-flow oscillators of different lengths.

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Magnetic field penetration in a long Josephson junction imbedded in a wide stripline

Cited by 21 publications

References 22 publications

Static properties of small Josephson tunnel junctions in an oblique magnetic field

Static properties of small Josephson tunnel junctions in an oblique magnetic field

Vortex qubit based on an annular Josephson junction containing a microshort

Josephson flux-flow oscillator: The microscopic tunneling approach

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