1,720,975 research outputs found
Switching phenomena and pulsed operation in long Josephson devices
No full textRecent findings by G.Pepe et al. (Appi.Phys.Lett.89, 2770, 2001) have given new insights over the dynamics of Josephson junctions subject to electronic pulse injection. These experiments can be considered important steps toward the study of non-equilibrium effects involved in junctions under very fast (e.g. laser induced) pumping signals. In the governing equations (sine-Gordon or coupled sine-Gordon depending on the system) pulse operation enters via Josephson current distribution or via bias current distribution. By means of numerical simulations here we study the dependence of the switching to resistive state on fast local depression of Josephson current. Next, using simulated electronic pulse train we show how the flip-flop operating mode found in G.Pepe et al. is a common feature of single or stacked Josephson systems without regard for the pulse waveform or the presence of the gap structure in the I-V characteristics. The effect of the length and of the magnetic field is also discussed
Thermal activation of Josephson vortices from metastable states in magnetic-field induced potentials
No full textExtreme multiphoton phenomena in Josephson junctions: Euclidean resonance
No full textDecay of a zero-voltage state of a Josephson junction at low temperature occurs via quantum tunneling through an effective potential barrier. An extremely small probability of quantum tunneling may become not very small under the action of an ac component of the bias current. The tunneling rate has a peak as a function of a dc component of the bias current (Euclidean resonance). An analysis of this extremely multiphoton process is done on the basis of classical trajectories in imaginary time. The studied phenomenon does not involve transitions between energy levels and, thus, is distinctly different from the well-known process of photon-assisted tunneling
Magnetic field controlled superconducting-resistive and resistive-superconducting transitions in highly hysteretic Josephson junctions
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Some highlights and trends in the field of superconducting junction radiation detectors
No full textThe aim of this paper is to review some aspects of Superconductive Tunnel Junctions (STJ) detectors. Principles and performances of such devices in the context of high energy resolution are briefly discussed. Some considerations concerning the possibility of employing the Josephson current as a probe of the excitation produced by the absorbed radiation is also reported. Elements of the nonequilibrium theoretical aspects concerning radiation interaction with a Josephson system are proposed together with very preliminary experimental attempts
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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