Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1980-06-06
1982-06-08
Zazworsky, John
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307245, 307476, 357 6, H03K 1792, H03K 19195, H03K 338
Patent
active
043341586
ABSTRACT:
An amplifying or switching superconductive device is described whose current-voltage characteristic is drastically altered by heavy injection of excess energetic quasi-particles. In this device, the superconducting bandgap of a superconducting layer is greatly altered by overinjection of energetic quasi-particles so that the bandgap changes greatly with respect to its thermal equilibrium value, and in most cases is made to vanish. In a preferred embodiment, a three electrode device is fabricated where at least one of the electrodes is a superconductor. Tunnel barriers are located between the electrodes. A first tunnel junction is used to heavily inject energetic quasi-particles into the superconducting electrode to change its superconducting bandgap drastically. In turn, this greatly modifies the current-voltage characteristics of the second tunnel junction. This device can be used to provide logic circuits, or as an amplifier, and has an output sufficiently large that it can drive other similar devices.
REFERENCES:
patent: 3116427 (1963-12-01), Giaever
patent: 3204115 (1965-08-01), Parmenter
patent: 3689780 (1972-09-01), Meissner et al.
patent: 4157555 (1979-06-01), Gray
L. R. Testardi, "Destruction of Superconductivity by Laser Light", Physical Review B, vol. 4, No. 7, Oct. 1, 1971, pp. 2189-2196.
P. M. Ginsberg, "Upper Limit for Quasi-Particle Recombination Time in a Superconductor", Physical Review Letters, vol. 8, No. 5, Mar. 1, 1962, pp. 204-207.
K. E. Gray, "A Superconducting Transistor", Appl. Phys. Letter, vol. 32, No. 6, Mar. 15, 1978, pp. 392-395.
W. H. Parker, "Modified Heating Theory of Nonequilibrium Superconductors", Physical Review B, vol. 12, No. 9, Nov. 1, 1975, pp. 3667-3672.
International Business Machines - Corporation
Stanland Jackson E.
Zazworsky John
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