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Voltage Controlled Proximity Effect Bridge

IP.com Disclosure Number: IPCOM000082905D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Harris, EP: AUTHOR

Abstract

IBM Technical Disclosure Bulletin, Vol.11, No.10, March 1969, p.1213, in an article entitled "Voltage-Controlled Superconducting Switch" by E. P Harris and R. W. Keyes, showed how the proximity effect in a superconductor semiconductor laminate structure could be modified by an externally applied voltage.

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Voltage Controlled Proximity Effect Bridge

IBM Technical Disclosure Bulletin, Vol.11, No.10, March 1969, p.1213, in an article entitled "Voltage-Controlled Superconducting Switch" by E. P Harris and
R. W. Keyes, showed how the proximity effect in a superconductor semiconductor laminate structure could be modified by an externally applied voltage.

The present publication describes how to use that structure to make a proximity effect weak link bridge, in which the weak link properties are activated and controlled by applying a voltage. The device consists of a superconducting thin film, a short length of which is covered with a semiconductor layer, an insulating layer and a metal layer in that order. The superconducting film and the semiconducting layer are on the order of 100-1000 Angstroms thick. The length of the sandwich structure superimposed on the superconductor must be on the order of a few microns or less, depending on the superconductor, for weak link behavior to occur.

The device is operated by applying a voltage between the metal layer and the semiconducting layer, negatively charging the semiconductor. As described in the above referenced article, increasing the number of electrons in the semiconductor enhances the proximity effect so that the transition temperature of the superconductor underneath is reduced from its zero voltage value, T(C(o)) to a lower value, T(C(v)). If the device is operated at a temperature between these temperatures, this regio...