Application of Single Charge Device for the Current Primary Standard
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Abstract
This article describes the properties of single Cooper pair transistors, a basic device of a single charge device by using the Coulomb blockade phenomenon to control single electrons or Cooper- pairs. Single Cooper pair transistors can be applied as a quantum standard in metrology. Single Cooper pair transistor is studied and fabricated by using electron beam lithography and electron gun evaporation techniques. Single Cooper pair transistor is measured at temperatures below 100 mK with a dilution refrigerator. The coulomb oscillation characteristic at the supercurrent peak shows the coherent Cooper-pair transport regime. It is possible to point out that the Cooper-pair tunnel with the frequency of coherent oscillation in order 16 gigahertz. Therefore, it is possible that it can be applied as an electron detector with other superconducting devices.
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