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IEVref:815-20-42ID:
Language:enStatus: Standard
Term: AC Josephson effect, <superconductor>
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Definition: macroscopic quantum effect in which, when a direct current (DC) voltage U is applied across a Josephson junction, an alternating current of Cooper pairs flows by tunnel effect through the junction, generating the emission of photons having a frequency f proportional to the applied voltage and satisfying the relation:

f=2eU/h

where h is the Planck constant and e is the elementary electric charge

Note 1 to entry: The AC Josephson effect also manifests itself conversely so that, when a Josephson junction is irradiated by an electromagnetic radiation of frequency f, the voltage across it can assume quantized values equal to (h/2e)nf, where n is a positive integer.

Note 2 to entry: f/U =483 597,848 416 984 Hz V-1.

Note 3 to entry: This entry was numbered 815-10-39 in IEC 60050-815:2015.


Publication date:2024-08
Source IEC 60050-121: 1998, 121-13-26, modified – The original definition has been adapted to apply to the area of electromagnetism. The original note to entry has been omitted and Notes 1 to 3 to entry have been added
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