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Showing 1 to 20 of 76 for “"Josephson Junctions"”.
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Quantum transport in Josephson junctions
Josephson junctions consist of two superconductors separated by some barrier, be it superconducting, ferromagnetic, or semiconducting. The striking feature of Josephson junctions is that for a phase difference between the two superconducting reservoirs, electrical current will flow between them. To …
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Cryogenic characterization of Josephson junctions
… of a superconducting quantum device, the Josephson junction. This thesis begins with a theoretical description of superconductivity and Josephson junctions, two superconductors separated by a thin insulating battier. Two models of Josephson barriers are presented for use in analysis. The …
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Thermal activation of superconducting Josephson junctions
… for scalable quantum computing architectures. Josephson junctions are extensively used in superconducting quantum interference devices (SQUIDs) and in persistent-current qubit systems. Noise excitations, however, have a critical influence on their dynamics. Thus, the primary focus of this …
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Josephson Junctions Fabricated by Focussed Ion Beam
… recent work on an innovative new approach to Josephson junction fabrication. These junctions are created in low TC superconductor-normal metal bilayer tracks on a deep submicron scale using a Focused Ion Beam Microscope (FIB). The FIB is used to mill away a trench 50_nm wide in the upper layer …
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Rapid fabrication of deep-submicron Josephson junctions
A process was designed to fabricate Nb-AlOx-Nb Josephson junctions for quantum computing applications, with the goal of fabricating junctions as small as 0.2 [micro]m in diameter in a time span of roughly two weeks. The process was based on the doubly-planarized all-refractory technology for …
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Digital frequency-division multiplexing using Josephson junctions
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1980.
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Superconducting Electron Transport in Graphene-Based Josephson Junctions
… (superconducting-normal-superconducting), or “Josephson” junctions. It was found that superconducting current (“supercurrent”) could flow through the normal (i.e. non-superconducting) graphene regions. The mechanism of this supercurrent is not fully explored. In this work, we study the …
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Phase-sensitive probes of extended topological Josephson junctions
… progress has been made in studying the Josephson effect in topological-insulator-based systems. The Josephson junction formed by a topological insulator in proximity to two superconductors (S-TI-S) is predicted to exhibit 4π-periodic signatures in the Josephson phase due to MBSs. We …
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Current-Phase Relations of Josephson Junctions with Ferromagnetic Barriers
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-12T20:40:54Z No. of bitstreams: 1 Frolov.pdf: 5531521 bytes, checksum: 087490e640910b31d2f35f988a65e3bd (MD5)
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The current-phase relation of graphene-based Josephson junctions
The current-phase relation (CPR) of a Josephson junction reveals valuable information about the microscopic processes and symmetries that influence the supercurrent. For the work described in this thesis, we have studied the CPR of graphene-based Jospehson junctions, inspired by previous …
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Some problems on macroscopic quantum phenomena and josephson junctions
… of macroscopic quantum phenomena in systems of Josephson junc-tion(s). In trying to determine in general the parameters of Josephson junction (this determination is essential for the test), we investigate the bottom pan of the ""returnI- V characterisiic of a current-biassed junction. We show …
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Unconventional superconductivity in topological insulator and magnetic Josephson junctions
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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The Fabrication of Josephson Junctions with an Electron Beam
… methods which can be used in the production of Josephson junctions in the high temperature superconductors, each with its pros and cons. In this thesis the use of a focused high energy (350keV) electron beam to damage the high temperature superconductor YBa$_{2}$Cu$_{3}$O$_{7-}$$_{\delta}$ as a …
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Theory of voltage oscillations in ultra-small capacitance Josephson junctions
"In ultra-small capacitance Josephson junctions, where the junction charging energy Eq =(2e)2 /2C is comparable to or larger than the junction coupling energy EJ, the quantum mechanical nature of the phase of the superconducting order parameter becomes important. Such quantum effects lead to novel …
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Proximity induced topological superconductivity in bulk insulating Bi0.8Sb1.2Te3using Josephson junctions
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation
… (STEM), can result in the formation of a Josephson junction. The conditions required for the formation of these Josephson junctions in YBa2Cu3O7-d and related compounds are discussed as well as the physical properties of the irradiated material. From electrical transport measurements of …
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Towards the fabrication of suspended superconductor-graphene-superconductor Josephson junctions
… student Joel Wang to design and fabricate Josephson junctions on high quality graphene samples. Using niobium, with its high critical magnetic field., as the superconducting contact metal, along with high mobility suspended graphene samples, we hope to measure the behavior of graphene …
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Conductivity and Interferometry Experiments on YBCO/lead Ramp-Edge Josephson Junctions
… YBa 2Cu3O7-y (YBCO) using YBCO/Pb ramp-edge Josephson junctions with lithographically defined corner and straight-edge geometries. Measurements of the critical current versus applied field, I c(H), and the an dynamic conductance, dI/dV, are presented. For junctions with corner geometries, as …
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Non-Sinusoidal Current -Phase Relations in Superconductor-Ferromagnet-Superconductor Josephson Junctions
… superconductor-ferromagnet-superconductor (SFS) Josephson junction, and determined that it contains a positive second-harmonic term proportional to sin(2&phis;). The second-harmonic term becomes dominant near Tpi, the temperature at which the first-order term switches between the 0-state and the …
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