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Keywords = SNS Josephson junctions

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18 pages, 3123 KiB  
Article
Contribution of Processes in SN Electrodes to the Transport Properties of SN-N-NS Josephson Junctions
by Vsevolod Ruzhickiy, Sergey Bakurskiy, Mikhail Kupriyanov, Nikolay Klenov, Igor Soloviev, Vasily Stolyarov and Alexander Golubov
Nanomaterials 2023, 13(12), 1873; https://doi.org/10.3390/nano13121873 - 16 Jun 2023
Cited by 11 | Viewed by 2216
Abstract
In this paper, we present a theoretical study of electronic transport in planar Josephson Superconductor–Normal Metal–Superconductor (SN-N-NS) bridges with arbitrary transparency of the SN interfaces. We formulate and solve the two-dimensional problem of finding the spatial distribution of the supercurrent in the SN [...] Read more.
In this paper, we present a theoretical study of electronic transport in planar Josephson Superconductor–Normal Metal–Superconductor (SN-N-NS) bridges with arbitrary transparency of the SN interfaces. We formulate and solve the two-dimensional problem of finding the spatial distribution of the supercurrent in the SN electrodes. This allows us to determine the scale of the weak coupling region in the SN-N-NS bridges, i.e., to describe this structure as a serial connection between the Josephson contact and the linear inductance of the current-carrying electrodes. We show that the presence of a two-dimensional spatial current distribution in the SN electrodes leads to a modification of the current–phase relation and the critical current magnitude of the bridges. In particular, the critical current decreases as the overlap area of the SN parts of the electrodes decreases. We show that this is accompanied by a transformation of the SN-N-NS structure from an SNS-type weak link to a double-barrier SINIS contact. In addition, we find the range of interface transparency in order to optimise device performance. The features we have discovered should have a significant impact on the operation of small-scale superconducting electronic devices, and should be taken into account in their design. Full article
(This article belongs to the Special Issue Nanostructures for Superconducting Electronics)
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16 pages, 6396 KiB  
Article
Fabrication Process for Deep Submicron SQUID Circuits with Three Independent Niobium Layers
by Silke Wolter, Julian Linek, Josepha Altmann, Thomas Weimann, Sylke Bechstein, Reinhold Kleiner, Jörn Beyer, Dieter Koelle and Oliver Kieler
Micromachines 2021, 12(4), 350; https://doi.org/10.3390/mi12040350 - 24 Mar 2021
Cited by 1 | Viewed by 3503
Abstract
We present a fabrication technology for nanoscale superconducting quantum interference devices (SQUIDs) with overdamped superconductor-normal metal-superconductor (SNS) trilayer Nb/HfTi/Nb Josephson junctions. A combination of electron-beam lithography with chemical-mechanical polishing and magnetron sputtering on thermally oxidized Si wafers is used to produce direct current [...] Read more.
We present a fabrication technology for nanoscale superconducting quantum interference devices (SQUIDs) with overdamped superconductor-normal metal-superconductor (SNS) trilayer Nb/HfTi/Nb Josephson junctions. A combination of electron-beam lithography with chemical-mechanical polishing and magnetron sputtering on thermally oxidized Si wafers is used to produce direct current SQUIDs with 100-nm-lateral dimensions for Nb lines and junctions. We extended the process from originally two to three independent Nb layers. This extension offers the possibility to realize superconducting vias to all Nb layers without the HfTi barrier, and hence to increase the density and complexity of circuit structures. We present results on the yield of this process and measurements of SQUID characteristics. Full article
(This article belongs to the Special Issue Nano and Micro Superconducting Quantum Interference Devices)
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33 pages, 3933 KiB  
Article
Thermodynamics of a Phase-Driven Proximity Josephson Junction
by Francesco Vischi, Matteo Carrega, Alessandro Braggio, Pauli Virtanen and Francesco Giazotto
Entropy 2019, 21(10), 1005; https://doi.org/10.3390/e21101005 - 15 Oct 2019
Cited by 5 | Viewed by 5027
Abstract
We study the thermodynamic properties of a superconductor/normal metal/superconductor Josephson junction in the short limit. Owing to the proximity effect, such a junction constitutes a thermodynamic system where phase difference, supercurrent, temperature and entropy are thermodynamical variables connected by equations of state. These [...] Read more.
We study the thermodynamic properties of a superconductor/normal metal/superconductor Josephson junction in the short limit. Owing to the proximity effect, such a junction constitutes a thermodynamic system where phase difference, supercurrent, temperature and entropy are thermodynamical variables connected by equations of state. These allow conceiving quasi-static processes that we characterize in terms of heat and work exchanged. Finally, we combine such processes to construct a Josephson-based Otto and Stirling cycles. We study the related performance in both engine and refrigerator operating mode. Full article
(This article belongs to the Special Issue Quantum Thermodynamics II)
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14 pages, 306 KiB  
Article
High-Frequency Electromagnetic Emission from Non-Local Wavefunctions
by Giovanni Modanese
Appl. Sci. 2019, 9(10), 1982; https://doi.org/10.3390/app9101982 - 15 May 2019
Cited by 6 | Viewed by 2455
Abstract
In systems with non-local potentials or other kinds of non-locality, the Landauer-Büttiker formula of quantum transport leads to replacing the usual gauge-invariant current density J with a current J e x t which has a non-local part and coincides with the current of [...] Read more.
In systems with non-local potentials or other kinds of non-locality, the Landauer-Büttiker formula of quantum transport leads to replacing the usual gauge-invariant current density J with a current J e x t which has a non-local part and coincides with the current of the extended Aharonov-Bohm electrodynamics. It follows that the electromagnetic field generated by this current can have some peculiar properties and in particular the electric field of an oscillating dipole can have a long-range longitudinal component. The calculation is complex because it requires the evaluation of double-retarded integrals. We report the outcome of some numerical integrations with specific parameters for the source: dipole length ∼10−7 cm, frequency 10 GHz. The resulting longitudinal field E L turns out to be of the order of 10 2 to 10 3 times larger than the transverse component (only for the non-local part of the current). Possible applications concern the radiation field generated by Josephson tunnelling in thick superconductor-normal-superconductor (SNS) junctions in yttrium barium oxide (YBCO) and by current flow in molecular nanodevices. Full article
(This article belongs to the Special Issue Quantum Optics for Fundamental Quantum Mechanics)
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