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Showing 1 to 20 of 176 for “"Josephson"”.
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Nanoscale Josephson Devices
… of materials, including the study of c-axis Josephson junctions in the high temperature superconductor Tl2Ba2CaCu2O8, the fabrication of superconducting quantum interference devices with sub-micron loop areas, and GaN light emitting diodes. The main body of research was carried out in the …
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Multi-terminal Josephson effect
Conventionally, a Josephson junction is an ubiquitous quantum device formed by a weak link between a pair of superconductors. In this work, we demonstrate the dc Josephson effect in mesoscopic junctions of more than two superconducting terminals. We report fabrication and characterization of the 3- …
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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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Existence de solutions périodiques de l'équation de Josephson
… des solutions périodiques de l’équation de Josephson. La première partie est consacrée au rappel des notions de base de l’espace L[exposant]2[indice]T et de quelques théorèmes fondamentaux sur les points fixes. Par la suite, après avoir défini le cadre d ’étude, nous établirons à l’aide du …
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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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Nonlinear dynamics of two-dimensional Josephson junction arrays
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Vortex motion and dynamical states in Josephson arrays
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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A Josephson junction bridge track and hold circuit
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
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Nonlinear dynamics of one-dimensional Josephson junction arrays
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1995.
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Josephson Currents In Two-Gap Superconductor-Insulator- Superconductor Junctions
… we study the microscopic structure of the Josephson current in a tunnel junction with a very narrow quasi-classical barrier. Also, the possibility of mid-gap states in two-gap superconductor is investigated, and their effects on the current-phase relation as well as the current density …
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Characterization of Josephson Devices for Use in Quantum Computation
This thesis examines Josephson tunnel junctions as candidate qubits for quantum computation. A large area current-biased junction, known as a phase qubit, uses the two lowest energy levels in a tilted washboard potential as the qubit states |0> and |1>. I performed experiments with 10 x 10 um^2 …
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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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Josephson Interferometry Measurements in High-Tc Grain Boundary Junctions
We study Josephson junctions formed at grain boundary interfaces in the high-Tc cuprate materials. The inherent properties of these Josephson junctions depend strongly on the pairing symmetry and the electronic structure at the interface and can be used to determine the pairing symmetry as well as …
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