Gate-assisted phase fluctuations in all-metallic Josephson junctions

Basset, Julien; Ognjen, Stanisavljević,; Kuzmanović, Marko; Gabelli, Julien; Quay, C. H. L.; Estève, Jérôme; Aprili, M.

doi:10.1103/physrevresearch.3.043169

Cited by 21 publications

(37 citation statements)

References 45 publications

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“…4a , orange dots), we get E eff ≈ 6.3 meV, indicating that, on average, the phonons thermalize more over the longer distance. A possible framework for analysing such SPDs in Josephson junctions subject to high-energy electrons was recently proposed elsewhere 38 .…”

Section: Nature Of Generated Phononsmentioning

confidence: 99%

Out-of-equilibrium phonons in gated superconducting switches

et al. 2022

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Recent experiments have suggested that superconductivity in metallic nanowires can be suppressed by the application of modest gate voltages. The source of this gate action has been debated and either attributed to an electric-field effect or to small leakage currents. Here we show that the suppression of superconductivity in titanium nitride nanowires on silicon substrates does not depend on the presence or absence of an electric field at the nanowire, but requires a current of high-energy electrons. The suppression is most efficient when electrons are injected into the nanowire, but similar results are obtained when electrons are passed between two remote electrodes. This is explained by the decay of high-energy electrons into phonons, which propagate through the substrate and affect superconductivity in the nanowire by generating quasiparticles. By studying the switching probability distribution of the nanowire, we also show that high-energy electron emission leads to a much broader phonon energy distribution compared with the case where superconductivity is suppressed by Joule heating near the nanowire.

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Section: Nature Of Generated Phononsmentioning

confidence: 99%

Out-of-equilibrium phonons in gated superconducting switches

et al. 2022

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“…For strong enough electric fields normal metal behaviour was observed. This phenomenon is known as the Superconductive Field Effect (SFE) and the results have been recently confirmed by other experimental groups [5][6][7][8][9][10][11].…”

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confidence: 54%

“…The microscopic origin of this phenomenon is unclear. All the materials [2,[5][6][7][8][9][10][11] analyzed are well described by the conventional BCS theory and metallic in the normal phase (hence it is surprising that the electrostatic field could play any role). It has been suggested that energetic quasi-particle injection from the gate control [6,7] or energy or phase fluctuations [9] could be responsible for the observations.…”

mentioning

confidence: 99%

“…All the materials [2,[5][6][7][8][9][10][11] analyzed are well described by the conventional BCS theory and metallic in the normal phase (hence it is surprising that the electrostatic field could play any role). It has been suggested that energetic quasi-particle injection from the gate control [6,7] or energy or phase fluctuations [9] could be responsible for the observations. These ideas seem to be precluded by recent ionic-gating experiments, where the electric field is generated by crystallised charges [12], as there is no moving charge.…”

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confidence: 99%

“…Alternate microscopic proposals have been suggested to explain the experimental results of [2,[5][6][7][8][9][10][11]. These include electric-field induced spin-orbit polarization [13], Rashba-like surface effects [14] and the excitation of an exotic superconducting state due to Schwinger-like effects [15].…”

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confidence: 99%

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Destroying superconductivity in thin films with an electric field

Amoretti¹,

Brattan²,

Magnoli³

et al. 2022

Preprint

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In this Letter we use a Ginzburg-Landau approach to show that a suitably strong electric field can drive a phase transition from a superconductor to a normal metal. The transition is induced by taking into account corrections to the permittivity due to the superconductive gap and persists even when screening effects are considered. We test the model against recent experimental observations in which a strong electric field has been observed to control the supercurrent in superconducting thin films. We find excellent agreement with the experimental data and are able to explain several observed features. We additionally suggest a way to test our theoretical proposal via superconductorsuperconductor electron tunneling.

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High Orbital‐Moment Cooper Pairs by Crystalline Symmetry Breaking

2023

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The pairing structure of superconducting materials is regulated by the point group symmetries of the crystal. The spin‐singlet multiorbital superconductivity of materials with unusually low crystalline symmetry content can host even‐parity (s‐wave) Cooper pairs with high orbital moment. The lack of mirror and rotation symmetries makes pairing states with quintet orbital angular momentum symmetry‐allowed. A remarkable fingerprint of this type of pairing state is provided by a nontrivial superconducting phase texture in momentum space with π‐shifted domains and walls with anomalous phase winding. The pattern of the quintet pairing texture is shown to depend on the orientation of the orbital polarization and the strength of the mirror and/or rotation symmetry breaking terms. Such a momentum dependent phase makes Cooper pairs with net orbital component suited to design orbitronic Josephson effects. This study discusses how an intrinsic orbital dependent phase can set out anomalous Josephson couplings by employing superconducting leads with nonequivalent breaking of crystalline symmetry.

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Gate-assisted phase fluctuations in all-metallic Josephson junctions

Cited by 21 publications

References 45 publications

Out-of-equilibrium phonons in gated superconducting switches

Out-of-equilibrium phonons in gated superconducting switches

Destroying superconductivity in thin films with an electric field

High Orbital‐Moment Cooper Pairs by Crystalline Symmetry Breaking

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