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IEVref: | 815-10-39 | ID: | |

Language: | en | Status: Standard | |

Term: | AC Josephson effect | ||

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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 electromagnetic wave having a frequency f proportional to the applied voltage and satisfying the relation:
where 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 Note 2 to entry: | ||

Publication date: | 2015-11 | ||

Source: | IEC 60050-121:1998, 121-13-26, modified | ||

Replaces: | |||

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CO remarks: | |||

TC/SC remarks: | |||

VT remarks: | |||

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Domain5: |

*f* = *2**eU/**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*/2*e*)*nf*, where *n* is an integer.

Note 2 to entry: *f/**U* = 483,6 MHz/μV.