Hybrid superconducting quantum magnetometer

Giazotto, Francesco; Taddei, F.

doi:10.1103/physrevb.84.214502

Cited by 44 publications

(73 citation statements)

References 34 publications

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“…Another situation is met in mesoscopic three-terminal Josephson junctions in which a single normal conductor is connected to three superconducting contacts [16][17][18][19][20]. The transport properties then depend on two independent (phase or voltage) variables.…”

Section: Introductionmentioning

confidence: 99%

Subgap structure in the conductance of a three-terminal Josephson junction

et al. 2014

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Three-terminal superconductor (S) -normal metal (N) -superconductor (S) Josephson junctions are investigated. In a geometry where a T-shape normal metal is connected to three superconducting reservoirs, new sub-gap structures appear in the differential resistance for specific combinations of the superconductor chemical potentials. Those correspond to a correlated motion of Cooper pairs within the device that persist well above the Thouless energy and is consistent with the prediction of quartets formed by two entangled Cooper pairs. A simplified nonequilibrium Keldysh Green's function calculation is presented that supports this interpretation.

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Section: Introductionmentioning

confidence: 99%

Subgap structure in the conductance of a three-terminal Josephson junction

et al. 2014

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“…The N nanowire, in clean metallic contact with the S ring, is proximized by the latter, and forms a SNS Josephson weak link. In this configuration, the density of states (DOS) of the N wire is modulated by the application of an external magnetic flux Φ piercing the loop, and enables the transition of the wire from the N-to the S-like state [13][14][15][16][17][18][19][20][21][22][23] .Since its original introduction, the SQUIPT has been exclusively implemented with a tunnel superconducting probe (S-SQUIPT) because of its sharper response and improved noise performance 1,[8][9][10][11][12] . Yet, it has been recently predicted that coherent thermal valves based on the proximity effect privilege SQUIPTs realized with a normal metal probe (N-SQUIPT), as the presence of the superconducting junction in the conventional S-SQUIPT design would severely limit the heat flow across the structure 24 .…”

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confidence: 99%

“…Based on the proximity effect 2-7 , it is considered a promising candidate for several advanced applications such as the next generation of ultra-high sensitive and ultra-low power magnetometers [8][9][10][11] . The SQUIPT is a two-terminal device made of a normal metal (N) nanowire embedded into a superconducting (S) ring, and coupled via a tunnel barrier to a probing electrode (see Fig.…”

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confidence: 99%

Normal metal tunnel junction-based superconducting quantum interference proximity transistor

D'Ambrosio

Meißner

Blanc

et al. 2015

Applied Physics Letters

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We report the fabrication and characterization of an alternative design for a superconducting quantum interference proximity transistor (SQUIPT) based on a normal metal (N) probe. The absence of direct Josephson coupling between the proximized metal nanowire and the N probe allows us to observe the full modulation of the wire density of states around zero voltage and current via the application of an external magnetic field. This results into a drastic suppression of power dissipation which can be as low as a few ∼ 10 −17 W. In this context the interferometer allows an improvement of up to four orders of magnitude with respect to earlier SQUIPT designs, and makes it ideal for extra-low power cryogenic applications. In addition, the N-SQUIPT has been recently predicted to be the enabling candidate for the implementation of coherent caloritronic devices based on proximity effect.The superconducting quantum interference proximity transistor (SQUIPT) is a magnetic-flux detector alternative to the widespread superconducting quantum interference device (SQUID) 1 . Based on the proximity effect 2-7 , it is considered a promising candidate for several advanced applications such as the next generation of ultra-high sensitive and ultra-low power magnetometers [8][9][10][11] . The SQUIPT is a two-terminal device made of a normal metal (N) nanowire embedded into a superconducting (S) ring, and coupled via a tunnel barrier to a probing electrode (see Fig. 1). The N nanowire, in clean metallic contact with the S ring, is proximized by the latter, and forms a SNS Josephson weak link. In this configuration, the density of states (DOS) of the N wire is modulated by the application of an external magnetic flux Φ piercing the loop, and enables the transition of the wire from the N-to the S-like state [13][14][15][16][17][18][19][20][21][22][23] .Since its original introduction, the SQUIPT has been exclusively implemented with a tunnel superconducting probe (S-SQUIPT) because of its sharper response and improved noise performance 1,[8][9][10][11][12] . Yet, it has been recently predicted that coherent thermal valves based on the proximity effect privilege SQUIPTs realized with a normal metal probe (N-SQUIPT), as the presence of the superconducting junction in the conventional S-SQUIPT design would severely limit the heat flow across the structure 24 . The N-SQUIPT appears therefore as a highly-promising candidate to implement future phasecoherent caloritronic devices such as heat transistors, rectifiers, thermal splitters and phase-tunable electron coolers 25 . Besides the foreseen advantages in coherent caloritronics, the N-SQUIPT shows attractive performance for more conventional electronic applications due to the lack of Josephson coupling. The N probe offers the possibility to operate the device around zero bias therefore allowing to reach extra-low power dissipation, down to a few tens of aW, which lowers by up to four orders of magnitude the previous achieved dissipation values [9][10][11] .Here we report the fabrication and ...

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“…The phase-controlled density of states (DOS) of the proximized nanowire makes the SQUIPT an ideal building block for the realization of heat nanovalves [4] or very sensitive and ultra-low-power dissipation magnetometers [5][6][7][8] able to succeed the state-of-the-art SQUID technologies, with particular interest in single-spin detection [9].…”

Section: Introductionmentioning

confidence: 99%

Coherent transport properties of a three-terminal hybrid superconducting interferometer

et al. 2017

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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.

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Hybrid superconducting quantum magnetometer

Cited by 44 publications

References 34 publications

Subgap structure in the conductance of a three-terminal Josephson junction

Subgap structure in the conductance of a three-terminal Josephson junction

Normal metal tunnel junction-based superconducting quantum interference proximity transistor

Coherent transport properties of a three-terminal hybrid superconducting interferometer

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