Nonlinear Critical-Current Thermal Response of an Asymmetric Josephson Tunnel Junction

Guarcello, Claudio; Braggio, Alessandro; Solinas, Paolo; Giazotto, Francesco

doi:10.1103/physrevapplied.11.024002

Cited by 35 publications

(30 citation statements)

References 71 publications

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“…Recently, phase-coherent heat transport in superconducting circuits has been observed experimentally [15]. The possibility to control heat currents via magnetic fields has led to a number of proposals for phase-coherent caloritronic devices such as heat interferometers [16,17] and diffractors [18,19], thermal rectifiers [20][21][22][23], transistors [24,25], switches [26] and circulators [27], thermometers [28,29] as well as heat engines [30][31][32] and refrigerators [33,34]. Experimentally, heat interferometers [15,35,36], the quantum diffraction of heat [37], thermal diodes [38] and a thermal router [39] have been realized so far.…”

Section: Introductionmentioning

confidence: 99%

Phase-dependent heat and charge transport through superconductor–quantum dot hybrids

Kamp

Sothmann

2019

Phys. Rev. B

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We analyze heat and charge transport through a single-level quantum dot coupled to two BCS superconductors at different temperatures to first order in the tunnel coupling. In order to describe the system theoretically, we extend a real-time diagrammatic technique that allows us to capture the interplay between superconducting correlations, strong Coulomb interactions and nonequilibrium physics. We find that a thermoelectric effect can arise due to the superconducting proximity effect on the dot. In the nonlinear regime, the thermoelectric current can also flow at the particle-hole symmetric point due to a level renormalization caused by virtual tunneling between the dot and the leads. The heat current through the quantum dot is sensitive to the superconducting phase difference. In the nonlinear regime, the system can act as a thermal diode. arXiv:1809.09428v3 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Phase-dependent heat and charge transport through superconductor–quantum dot hybrids

Kamp

Sothmann

2019

Phys. Rev. B

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“…In this regard, we note that the sharpness of the jump depends usually on the inverse of the Dynes parameter, Γ −1 j , as it is discussed in Ref. [19]. Anyway, here we are assuming to keep constant the value of the Dynes parameter, so that the smoothing of the I c jump in Fig.…”

Section: A the Operating Temperaturesmentioning

confidence: 85%

“…In this section we discuss the operating principles of a radiation detector based on the discontinuous thermal response of the critical current, I c , of an asymmetric tunnel JJ [19]. This behavior emerges by changing the electronic temperature of the electrodes of the junction.…”

Section: Detection Operating Principlesmentioning

confidence: 99%

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Josephson-Threshold Calorimeter

et al. 2019

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We suggest a single-photon thermal detector based on the abrupt jump of the critical current of a temperature-biased tunnel Josephson junction formed by different superconductors, working in the dissipationless regime. The electrode with the lower critical temperature is used as a radiation sensing element, so it is thermally floating and is connected to an antenna/absorber. The warming up resulting from the absorption of a photon can induce a drastic measurable enhancement of the critical current of the junction. We propose a detection scheme based on a threshold mechanism for single-or multi-photon detection. This Josephson threshold detector has indeed calorimetric capabilities being able to discriminate the energy of the incident photon. So, for the realistic setup that we discuss, our detector can efficiently work as a calorimeter for photons from the mid infrared, through the optical, into the ultraviolet, specifically, for photons with frequencies in the range [30 − 9 × 10 4 ] THz. In the whole range of detectable frequencies, we obtain a resolving power significantly larger than one. In order to reveal the signal, we suggest the fast measurement of the Josephson kinetic inductance. Indeed, the photon-induced change in the critical current affects the Josephson kinetic inductance of the junction, which can be non-invasively read through an LC tank circuit, inductively coupled to the junction. Finally, this readout scheme shows remarkable multiplexing capabilities.

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“…In this regard, a current-biased Josephson junction is of particular interest for applications as a threshold detector since its phase dynamics is altered even by a weak probe field. Rich dynamics of the JJ constantly inspires new applications, such as thermometry [7,8], noise statistics [9][10][11] and single photon detection [12].…”

Section: Introductionmentioning

confidence: 99%

Microwave photon detection by an Al Josephson junction

Revin¹,

Pankratov²,

Gordeeva³

et al. 2020

Preprint

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The aluminum Josephson junction (JJ) with a critical current, suppressed by a factor of three comparing with the maximal value calculated from the gap, is experimentally investigated for application as a threshold detector of microwave photons. We present the preliminary results of measurements of the lifetime of the superconducting state and the probability of switching by 9 GHz external signal. We found an anomalously large lifetime, not described by the Kramers' theory for the escape time over a barrier under the influence of fluctuations. We explain it by the phase diffusion regime, which is evident from the temperature dependence of the switching current histograms. Therefore, the phase diffusion allows to significantly improve the noise immunity of a device, radically decreasing the dark count rate, but it will also decrease the single photon sensitivity of the considered threshold detector. Quantization of the switching probability tilt versus signal attenuation for various bias currents through the JJ is observed, which resembles the differentiation between N and N+1 photon absorption.

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Nonlinear Critical-Current Thermal Response of an Asymmetric Josephson Tunnel Junction

Cited by 35 publications

References 71 publications

Phase-dependent heat and charge transport through superconductor–quantum dot hybrids

Phase-dependent heat and charge transport through superconductor–quantum dot hybrids

Josephson-Threshold Calorimeter

Microwave photon detection by an Al Josephson junction

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