Superconducting tunneling without the tunneling Hamiltonian. II. Subgap harmonic structure

Arnold, G.

doi:10.1007/bf00682620

Cited by 159 publications

(141 citation statements)

References 9 publications

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“…This results in the symmetry relation Ǧ (x) =Ǧ(−x), which allows us to replace the functionǦ +0 in the boundary condition (5) and in the expression (6) for the electric current by the inverse gauge transformation of the functionǦ −0 ,…”

Section: Basic Equationsmentioning

confidence: 99%

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Multiparticle tunnelling in diffusive superconducting junctions

Bezuglyĭ¹,

Vasenko²,

Bratus³

et al. 2007

Supercond. Sci. Technol.

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Abstract. We formulate a theoretical framework to describe multiparticle current transport in planar superconducting tunnel junctions with diffusive electrodes. The approach is based on direct solving of quasiclassical Keldysh-Green function equations for nonequilibrium superconductors, and consists of a combination of a circuit theory analysis and improved perturbation expansion. The theory predicts much greater scaling parameter for the subharmonic gap structure of the tunnel current in diffusive junctions compared to the one in ballistic junctions and mesoscopic constrictions with the same barrier transparency.PACS numbers: 74.45.+c, 74.40.+k, 74.25.Fy, 74.50.+r. Multiparticle tunnelling in diffusive superconducting junctions Figure 1. One-dimensional (a) and planar (b) models of the tunnel junction.

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Section: Basic Equationsmentioning

confidence: 99%

“…It has been shown in [2,3] that the MPT is completely equivalent to the coherent multiple Andreev reflection mechanism (MAR) [4,5]. Here we use the term MPT to emphasize the low transparency, tunnel junction limit, leaving the term MAR for a general case of transparent weak links.…”

Section: Introductionmentioning

confidence: 99%

Multiparticle tunnelling in diffusive superconducting junctions

Bezuglyĭ¹,

Vasenko²,

Bratus³

et al. 2007

Supercond. Sci. Technol.

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“…For the data shown here V p = 0.11 ± 0.01 mV, resulting in Γ ∼ 300 GHz. We expect that the effects of phase fluctuations would be to broaden the subgap features [11,18] similarly to the broadening of microwave induced Shapiro steps [22]. It is therefore important to determine whether the broadening of the SGS features in our junctions (Fig.…”

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confidence: 97%

“…Experiments using controllable atomic break junctions [3,7] have traced the behavior of the SGS through a wide range of junction transparencies from the tunneling to the point contact regimes. These have led to a theoretical effort [4,5,6,18] to interpolate between the descriptions of SGS in the low (MPT) and high (MAR) transparency limits.…”

mentioning

confidence: 99%

“…This experiment has been done under conditions where strong phase fluctuations are present, and by analyzing the Josephson effect in these junctions we have determined the broadening of the Josephson oscillation linewidth due to these fluctuations. Since modern theories for the origins of the excess subgap current [4,5,6,18] suggest that the subharmonic gap structure and the ac Josephson effect are intimately related, it could be expected that strong phase fluctuations will alter the shape of the SGS. Nevertheless, we conclude that the apparent smearing of the observed SGS in our data is most likely due to the intrinsic gap anisotropy in Pb, rather than phase fluctuations.…”

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Subharmonic gap structure in superconducting scanning tunneling microscope junctions

Naaman

Dynes

2004

Solid State Communications

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We observe a subharmonic gap sturucture (SGS) and the Josephson effect in superconducting scanning tunneling microscope junctions with resistances below 100 kΩ. The magnitude of the n = 2 SGS is shown to scale with the square of the junction normal state conductance, in agreement with theory. We show by analyzing the Josephson effect in these junctions that the superconducting phase dynamics are strongly affected by thermal fluctuations. We estimate the linewidth of the Josephson oscillations due to phase fluctuations, a quantity that may be important in modern theories of the subgap structure. While phase fluctuations may smear the SGS current onsets, we conclude that the sharpness of these onsets in our data is not limited by fluctuations.

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Stromfluß durch ein einzelnes Atom: Atom‐Orbitale dienen als Transportkanäle in metallischen Quantenpunktkontakten

Scheer¹

1999

Phys. Bl.

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Superconducting tunneling without the tunneling Hamiltonian. II. Subgap harmonic structure

Cited by 159 publications

References 9 publications

Multiparticle tunnelling in diffusive superconducting junctions

Multiparticle tunnelling in diffusive superconducting junctions

Subharmonic gap structure in superconducting scanning tunneling microscope junctions

Stromfluß durch ein einzelnes Atom: Atom‐Orbitale dienen als Transportkanäle in metallischen Quantenpunktkontakten

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