Electron cooling by phonons in superconducting proximity structures

Nikolić, Danilo; Basko, D. M.; Belzig, Wolfgang

doi:10.1103/physrevb.102.214514

Cited by 9 publications

(7 citation statements)

References 36 publications

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“…Since is related to the overheating phenomena and to the heat exchange, its amplitude and the temperature at which it appears should depend on the length of the junction, its environment as well as on microscopic mechanisms in play. For instance, the efficiency of the heat exchange via electron-phonon mechanism has strong temperature dependence in the dirty limit 29 ( Supplementary Materials ) and provides good thermal equilibrium between electron and phonon baths at temperatures above 1K 1 , 2 , 30 , 31 . Our experimental conditions are close to the case when the exchange between the electron and phonon baths is proportional to , where U is the volume of the NW 29 .…”

Section: Resultsmentioning

confidence: 99%

“…For instance, the efficiency of the heat exchange via electron-phonon mechanism has strong temperature dependence in the dirty limit 29 ( Supplementary Materials ) and provides good thermal equilibrium between electron and phonon baths at temperatures above 1K 1 , 2 , 30 , 31 . Our experimental conditions are close to the case when the exchange between the electron and phonon baths is proportional to , where U is the volume of the NW 29 . Other channels of the heat removal from the system are significantly limited, due to a poor link of the NW to substrate and to superconducting electrodes.…”

Section: Resultsmentioning

confidence: 99%

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Environment-induced overheating phenomena in Au-nanowire based Josephson junctions

Skryabina

Bakurskiy

Shishkin

et al. 2021

Sci Rep

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Unlike conventional planar Josephson junctions, nanowire-based devices have a bridge geometry with a peculiar coupling to environment that can favor non-equilibrium electronic phenomena. Here we measure the influence of the electron bath overheating on critical current of several bridge-like junctions built on a single Au-nanowire. Using the Usadel theory and applying the two-fluid description for the normal and superconducting components of the flowing currents, we reveal and explain the mutual influence of the neighbouring junctions on their characteristics through various processes of the electron gas overheating. Our results provide additional ways to control nanowire-based superconducting devices.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Environment-induced overheating phenomena in Au-nanowire based Josephson junctions

Skryabina

Bakurskiy

Shishkin

et al. 2021

Sci Rep

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show abstract

“…The second channel is the transfer of excess energy to phonons. In dirty metals, the rate of this process , P e-ph , is given by [77] P e-ph = K * 3ζ(5) 3π…”

Section: A Dissipated and Absorbed Powermentioning

confidence: 99%

Miniaturization of Josephson Junctions for Digital Superconducting Circuits

et al. 2021

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In this work, we briefly overview various options for Josephson junctions, which should be scalable down to nanometer range for utilization in nanoscale digital superconducting technology. Such junctions should possess high values of critical current, I c , and normal state resistance, R N . Another requirement is the high reproducibility of the junction parameters across a wafer in a fabrication process. We argue that superconductor-normal metal-superconductor (SN -N -NS) Josephson junction of "variable thickness bridge" geometry is a promising choice to meet these requirements. Theoretical analysis of the SN -N -NS junction is performed in the case where the distance between the S electrodes is comparable to the coherence length of the N material. The restriction on the junction geometrical parameters providing the existence of superconductivity in the S electrodes is derived for the current flowing through the junction of an order of I c . The junction heating, as well as available mechanisms for the heat removal, is analyzed. The obtained results show that a SN -N -NS junction with a high (submillivolt) value of I c R N product can be fabricated from a broadly utilized combination of materials like Nb/Cu using well-established technological processes. The junction area can be scaled down to that of semiconductor transistors fabricated in the frame of a 40-nm process.

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“…The nanofabricated detector of worked in the regime where the measurement cut-off frequency was 10 kHz, which falls somewhat below 1/τ . Furthermore the metallic absorber was proximitized by a superconducting contact further decreasing C and G th (Heikkilä and Giazotto, 2009;Nikolic et al, 2020) and this way improving its performance. The experiment (Fig.…”

Section: E Energy Sensitivity Of a Calorimetermentioning

confidence: 99%

Colloquium: Quantum heat transport in condensed matter systems

Pekola,

Karimi

2021

Preprint

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In this Colloquium recent advances in the field of quantum heat transport are reviewed. This topic has been investigated theoretically for several decades, but only during the past twenty years have experiments on various mesoscopic systems become feasible. A summary of the theoretical basis for describing heat transport in one-dimensional channels is first provided. Then the main experimental investigations of quantized heat conductance due to phonons, photons, electrons, and anyons in such channels are presented. These experiments are important for understanding the fundamental processes that underly the concept of a heat conductance quantum for a single channel. Then an illustration on how one can control the quantum heat transport by means of electric and magnetic fields, and how such tunable heat currents can be useful in devices is given. This lays the basis for realizing various thermal device components such as quantum heat valves, rectifiers, heat engines, refrigerators, and calorimeters. Also of interest are fluctuations of quantum heat currents, both for fundamental reasons and for optimizing the most sensitive thermal detectors; at the end of the review the status of research on this intriguing topic is given.

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Electron cooling by phonons in superconducting proximity structures

Cited by 9 publications

References 36 publications

Environment-induced overheating phenomena in Au-nanowire based Josephson junctions

Environment-induced overheating phenomena in Au-nanowire based Josephson junctions

Miniaturization of Josephson Junctions for Digital Superconducting Circuits

Colloquium: Quantum heat transport in condensed matter systems

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