Untitled

Zhou, Fei; Charlat, P.; Spivak, B.; Pannetier, B.

doi:10.1023/a:1022628927203

Cited by 131 publications

(158 citation statements)

References 6 publications

Supporting

Mentioning

141

Contrasting

Order By: Relevance

“…Whereas the minigap is a nonlocal property that can be modulated by the magnetic fluxes, the shape of the DOS for energies larger than the minigap changes along the junction. Notice that for a single flux ( R = 0) the DOS shows two additional peaks at the minigap of the nanowire at energy ± w similar to the edge peaks expected in two-terminal SNS junctions [30].…”

Section: The Density Of States In the N Regionsupporting

confidence: 65%

Coherent transport properties of a three-terminal hybrid superconducting interferometer

et al. 2017

View full text Add to dashboard Cite

Coherent transport properties of a three-terminal hybrid superconducting interferometerVischi, F.; Carrega, M.; Strambini, E.; D'Ambrosio, S.; Bergeret, F. S.; Nazarov, Yuli; Giazotto, F. Important noteTo cite this publication, please use the final published version (if applicable). Please check the document version above. CopyrightOther than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons. Takedown policyPlease contact us and provide details if you believe this document breaches copyrights. We will remove access to the work immediately and investigate your claim. We present an exhaustive theoretical analysis of a double-loop Josephson proximity interferometer, such as the one recently realized by Strambini et al. for control of the Andreev spectrum via an external magnetic field. This system, called ω-SQUIPT, consists of a T-shaped diffusive normal metal (N ) attached to three superconductors (S) forming a double-loop configuration. By using the quasiclassical Green-function formalism, we calculate the local normalized density of states, the Josephson currents through the device, and the dependence of the former on the length of the junction arms, the applied magnetic field, and the S/N interface transparencies. We show that by tuning the fluxes through the double loop, the system undergoes transitions from a gapped to a gapless state. We also evaluate the Josephson currents flowing in the different arms as a function of magnetic fluxes, and we explore the quasiparticle transport by considering a metallic probe tunnel-coupled to the Josephson junction and calculating its I -V characteristics. Finally, we study the performances of the ω-SQUIPT and its potential applications by investigating its electrical and magnetometric properties.

show abstract

Section: The Density Of States In the N Regionsupporting

confidence: 65%

Coherent transport properties of a three-terminal hybrid superconducting interferometer

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In the limit of negligible geometric inductance of the ring it follows that ϕ = 2πΦ/Φ 0 , where ϕ is the phase difference across the SN boundaries, Φ is the applied magnetic flux through the loop, and Φ 0 = 2.067×10 −15 Wb is the flux quantum. The ring geometry allows to change ϕ which leads to the modification of the N-wire DoS 14 and, in turn, a drastic modification of thermal transport through the device. The DoS in the N wire (N wire ) is given by N wire (ε, x) = |Re[g R (ε, x)]|, where g R is the normal retarded quasiclassical Green's function, ε is the energy, and x is the spatial coordinate along the wire.…”

mentioning

confidence: 99%

Proximity nanovalve with large phase-tunable thermal conductance

Strambini

Bergeret

Giazotto

2014

Applied Physics Letters

View full text Add to dashboard Cite

We propose a phase-controlled heat-flux quantum valve based on the proximity effect driven by a superconducting quantum interference proximity transistor (SQUIPT). Its operation relies on the phase-dependent quasiparticle density of states in the Josephson weak-link of the SQUIPT which controls thermal transport across the device. In a realistic Al/Cu-based setup the structure can provide efficient control of thermal current inducing temperature swings exceeding ∼ 100 mK, and flux-to-temperature transfer coefficients up to ∼ 500 mK/Φ 0 below 100 mK. The nanovalve performances improve by lowering the bath temperature, making the proposed structure a promising building-block for the implementation of coherent caloritronic devices operating below 1 K.Phase-dependent manipulation of heat in solid-state nanodevices is nowadays one of the major challenges of coherent caloritronics 1 , and plays a key role in determining the physical properties of mesoscopic systems at low temperature. Toward this direction, the prototype for a heat interferometer has been recently realized with a superconducting quantum interference device (SQUID) where the modulation of the thermal current has been achieved thanks to the Josephson coupling 2-5 . Yet, phase-dependent thermal transport has been also demonstrated in Andreev interferometers 6-8 where the proximity effect in a normal metal affects its thermal conductance, and is controlled via a magnetic field.Here we propose an alternative approach to control heat transport by envisioning a thermal nanovalve based on proximity effect but phase-controlled by a SQUIPT 9-12 . Differing from SQUID-based and Andreev interferometers our device allows a drastic quenching of the thermal conductance which makes our proposal an efficient phase-tunable thermal nanovalve. Specifically, we expect an improvement of the temperature swing (up to ∼ 100 mK) and a flux-to-temperature transfer function exceeding 500 mK/Φ 0 at 100 mK.A sketch for the proximity nanovalve is shown in Fig. 1(a) and consists of a SQUIPT composed by a superconducting (S) ring interrupted by a diffusive normal metal (N) wire of length L. We assume the wire transverse dimensions to be negligible in comparison to its length so that it can be considered as quasi-onedimensional. Superconducting correlations are induced in the N wire owing to proximity effect from the S loop a) Electronic

show abstract

“…Here, the junction length L is much larger than the superconducting coherence length s , so that the Thouless energy E Th @D=L 2 [13] is much smaller than the superconducting gap . In this so-called long junction limit, the Thouless energy defines the magnitude of the proximity effects [13], including the proximity-induced mini-gap width [14,15] and the critical current [16].…”

mentioning

confidence: 99%

Origin of Hysteresis in a Proximity Josephson Junction

Courtois

Meschke²,

Peltonen³

et al. 2008

Phys. Rev. Lett.

255

259

View full text Add to dashboard Cite

We investigate hysteresis in the transport properties of superconductor -normal-metal -superconductor (S-N-S) junctions at low temperatures by measuring directly the electron temperature in the normal metal. Our results demonstrate unambiguously that the hysteresis results from an increase of the normal-metal electron temperature once the junction switches to the resistive state. In our geometry, the electron temperature increase is governed by the thermal resistance of the superconducting electrodes of the junction.

show abstract

Untitled

Cited by 131 publications

References 6 publications

Coherent transport properties of a three-terminal hybrid superconducting interferometer

Coherent transport properties of a three-terminal hybrid superconducting interferometer

Proximity nanovalve with large phase-tunable thermal conductance

Origin of Hysteresis in a Proximity Josephson Junction

Contact Info

Product

Resources

About