Synchronization of underdamped Josephson-junction arrays |
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| Authors: | Email author" target="_blank">G?FilatrellaEmail author N?Falsig Pedersen C?John Lobb P?Barbara |
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| Institution: | (1) Coherentia/INFM Unit Salerno and Science Faculty, University of Sannio, 82100 Benevento, Italy;(2) Department of Electrical Power Engineering, The Technical University of Denmark, 2800 Lyngby, Denmark;(3) Center for Superconductivity Research, Department of Physics, University of Maryland, MD 20742 College Park, USA;(4) Department of Physics, Georgetown University, DC 20057 Washington, USA |
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| Abstract: | Our recent experiments show that arrays of underdamped Josephson junctions radiate coherently only above a threshold number of junctions switched onto the radiating state. For each junction, the radiating state is a resonant step in the current-voltage characteristics due to the interaction between the junctions in the array and an electromagnetic cavity. Here we show that a model of a one-dimensional array of Josephson junctions coupled to a resonator can produce many features of the coherent be havior above threshold, including coherent radiation of power and the shape of the array current-voltage characteristic. The model also makes quantitative predictions about the degree of coherence of the junctions in the array. However, in this model there is no threshold; the experimental below-threshold region behavior could not be reproduced.Received: 11 April 2003, Published online: 23 July 2003PACS:
74.50.+r Tunneling phenomena; point contacts, weak links, Josephson
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85.25.-j Superconducting devices |
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| Keywords: | PACS 73 20 -r Electron states at surfaces and interfaces – 71 38 -k Polarons and electron-phonon interactions – 63 20 Kr Phonon-electron and phonon-phonon interactions |
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