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Showing 1 to 20 of 26 for “"Josephson Effect"”.
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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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Probing the superconducting order parameter of Iron-based superconductors through the Josephson effect
… the results we obtained regarding the use of the Josephson effect to probe the symmetry of the superconducting order parameter of Co-doped Ba(FeAs)2 crystals (Ba122). This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 …
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Novel applications of the Josephson Effect: Ferroelectric Characterisation and Capacitively Shunted Grain Boundary Junctions
This thesis describes applications of the ac Josephson effect. Firstly, results are presented from bicrystal grain boundary YBa2Cu3O7-d junctions shunted with a YBa2Cu3O7-d/SrTiO3/Au multilayer external capacitor, to make a junction with a hysteretic current voltage characteristic operating at high …
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Fluxon Dynamics In Two-Gap Superconductor-Based Long Josephson Junction
… superconductors. The phase dynamics in a long Josephson junction (LJJ) may be described by using the sine-Gordon equation. The difference in the phase dynamics between the LJJ with two-gap superconductors and that with the one-gap superconductors arises due to the presence of multiple tunneling …
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Exploring the interplay between topological order, magnetism and superconductivity
… mass momentum. Chapter 4 describes the new spin Josephson effect. We explore a spin Josephson effect in a system of two ferromagnets coupled by a tunnel junction formed of 2D time-reversal invariant topological insulators. In analogy with the more commonly studied instance of the Josephson effect …
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Phase coherence in the regime of bilayer exciton condensation
… behavior and an I/V curve reminiscent of the Josephson effect of superconductivity.
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Microwave response of nonlinear oscillations in resistively shunted superconducting nanowires
… rely on the modulation of nonlinear dynamics in Josephson junctions for functionality. More recently, however, superconducting devices have been developed based on the switching and thermal heating of nanowires for use in fields such as single photon detection and digital logic. In this Master's …
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The superconducting proximity effect in Bi2Se3 thin-films
… each other through the superconducting proximity effect and the Josephson effect. Theoretical work asserts that this system supports so-called Majorana bound states, which are exotic excitations that possess some of the features necessary to construct a topologically protected quantum bit. …
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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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Optical excitations in cold gases
In this thesis, we study the effects of interparticle interactions on the optical spectrum of cold gases. We first consider homogenous gas in the weak excitation regime and find that the optical spectrum of a system of Bosons is highly sensitive to interactions. We find that optical excitations, at …
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Microwave Response in Superconducting Nanowires
… it is consistent with our observations. The AC Josephson effect is observed in the PSC state (but not in the normal state, to which the wire transits at high bias when no MW is applied) and modeled using a multi-valued current phase relationship. With our model we are able to reproduce the …
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Tunneling in Degenerate Atomic Gases
… matter. In this thesis, various tunneling effects in both bosonic and fermionic gases are investigated. The first part of this work deals with bosons in different Josephson-type experimental setups. After a brief general introduction we establish, in Chapter 2, a mapping between the phase …
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Quantised charge pumping in a perpendicular magnetic field
… In the electrical domain, the quantum Hall effect and Josephson effect provide quantum standards for resistance and voltage, respectively. Combining them through Ampere's law yields an indirect quantum standard for current. However, a quantum metrological redefinition of the ampere requires …
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Conductivity and Interferometry experiments on YBCO/Pb Ramp-Edge Josephson Junctions
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-13T02:26:38Z No. of bitstreams: 1 hilliard.pdf: 21104520 bytes, checksum: 04a718c8258d783f199317b7e9ea37a4 (MD5)
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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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Computational Modeling of Superconductivity from the Set of Time-Dependent Ginzburg-Landau Equations for Advancements in Theory and Applications
… modern applications, is introduced. The Josephson effect and associated Josephson junction are discussed for comparison to our analogous results with the 1-D superconducting wire. The mathematics of microscopic theory of superconductivity are explored with mention of BCS theory. The …
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Topics in the Theory of Bose -Einstein Condensates With a Spin Degree of Freedom
… then turn to the problem of condensing a gas of effectively spin 1/2 atoms. We argue that if spin relaxation mechanisms are slow enough, the condensate displays the phenomenon of fragmentation. The main difference of the fragmented state that we study and other fragmented states discussed in the …
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Topics in the Theory of Quantum Degenerate Gases
… temperatures. In the second part we consider the Josephson Effect between two spatially separated Bose-Einstein condensates of atoms each of which can be in two hyperfine states. We derive simple equations of motion for this system closely analogous to the Bloch equations. We also map the dynamics …
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Topics in the theory of quantum degenerate gases
… temperatures. In the second part we consider the Josephson Effect between two spatially separated Bose-Einstein condensates of atoms each of which can be in two hyperfine states. We derive simple equations of motion for this system closely analogous to the Bloch equations. We also map the dynamics …
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Rotational Symmetry and Phase Dynamics in Topological Superconductors
… minima, even at zero temperature. While this effect can be neglected for gapped baths, our bath has minima that correspond to different bath topologies. This enforces the bath to undergo gap closing along the tunnelling path. We develop a field theory for this quantum tunnelling problem, …
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