<scp>LTS J</scp>osephson Junctions and Circuits

Meyer, H.‐G.; Fritzsch, L.; Anders, S.; Schmelz, M.; Kunert, J.; Oelsner, G.

doi:10.1002/3527600434.eap744

Cited by 3 publications

(3 citation statements)

References 131 publications

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“…In our previous experiments [10][11][12] , we applied this methodology to study the transport of Cooper pairs through an (NF)nN multilayer typically composed of n = 10 metallic NF bilayers, sometimes with an additional nm-thick insulating (I = Al/AlOx) tunnel barrier. Instead of the conventional Fraunhofer Ic(H) dependence expected for SNS and SIS junctions 13 , we have observed SQUID-like Ic oscillations as a function of the in-plane magnetic field 14 . In our previous work 10 , this finding was explained by hypothesizing the presence of edge currents in the hybrid weak link, while the question of their directionality (one-or two-way transport) remained open.…”

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confidence: 68%

Evidence for non-trivial edge modes in binary multilayers formed by normal and magnetic nm-thick metallic films

Belogolovskii,

Nevirkovets

2024

Preprint

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Unidirectional and backscatter-free propagation of charge carriers in three-dimensional materials is of fundamental interest in physics and high demand for practical implementations in quantum electronic circuits. Using phase-sensitive Josephson interferometry, we have identified edge-localized and chiral current-carrying modes in binary heterostructures formed by alternating nanometer-thick films of ferromagnetic (F = Ni) and normal (N = Al) metals with an insulating (I = Al/AlOx) interlayer which are coupling two superconducting (S = Nb) electrodes. Instead of conventional Fraunhofer-like patterns, the vertically stacked S(NF)10NI(NF)10NS Josephson junctions exhibit SQUID-like maximum supercurrent versus in-plane magnetic field characteristics with a normal (h/e) rather than superconducting (h/2e) flux quantum periodicity. The subsequent replacement of the I interlayer with a Josephson S'IS' junction (S/ is an ultrathin Nb film), which acts as a “bottleneck” controlling the supercurrent throughout the entire device, revealed the transformation of edge currents upon their contact with the S' plane into hybrid electron-hole modes propagating along it. Possible reasons for the emergence of chiral edge currents in the heterostructures based on conventional and well-studied materials are discussed.

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confidence: 68%

Evidence for non-trivial edge modes in binary multilayers formed by normal and magnetic nm-thick metallic films

Belogolovskii,

Nevirkovets

2024

Preprint

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“…The total quasiparticle current-vs-voltage characteristics of S/N-I-S heterostructures can be represented as a sum of independent contributions from individual transverse modes with a known distribution ( ) D ρ of their transmission probabilities. Averaging the I-V curves for fixed parameters Z with the distribution function (1) we get an expected dissipative current-voltage characteristic for an S/N-I-S fourlayered device with ideally disordered insulating barrier. Further, it will be characterized by the ratio of the subgap…”

Section: ( ) D ρmentioning

confidence: 98%

“…Therefore, notwithstanding some excellent results in specific areas such as voltage standard and RSFQ circuits, where superconductive Josephson junctions are providing the best solution to some of the mentioned items [1], the research is still active to achieve an "ideal" basic element for superconductive active circuits. Since for medium-to high-integration applications mentioned above one common desire is to have devices with non-hysteretic current-voltage (I-V) characteristics, intrinsic shunting of the barrier can achieve the objective, while keeping the size of the circuits as small as possible.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Internally Shunted Josephson Junctions

Lacquaniti

Cassiago

Leo

et al. 2016

IEEE Trans. Appl. Supercond.

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Following the ever-rising demand for new functionalities and novel materials in superconducting circuitry, we provide a complete view on the self-shunting problem in Josephson junctions relating it to specific features of a multichannel weak link between electrodes where averaging over the channels yields a bimodal distribution of transparencies with maxima near unity and zero. We provide two examples of such internally-shunted devices, four-layered Nb/Al-Al oxide-Nb junctions with strongly disordered nm-thick insulating layers where stochastic distribution of transparencies takes place on a local rather than a global scale and MoRe/W-doped Si-Si-MoRe devices with strongly inhomogeneous silicon interlayers partly doped by metallic nanoclusters where the main charge transport occurs across resonance-percolating trajectories. We show how the predicted universal distribution function of transmission coefficients can be verified experimentally without any fitting parameters and analyze some old and new experimental data from this perspective. We believe that our results can form a base for novel four-layered Josephson junctions with enhanced superconducting properties and, at the same time, well-separated metallic electrodes.

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