Shot noise beyond the Tucker theory in niobium tunnel junction mixers

P. Dieleman, T. M. Klapwijk

OnderzoeksoutputAcademicpeer review

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The electrical and shot-noise characteristics of high-current-density niobium superconductor–insulator–superconductor (SIS) tunnel junctions suitable for heterodyne detection of THz radiation are studied. It is found that a significant part of the current at voltages V<2Δ/e is carried via barrier defects (pinholes). Due to the transport mechanism in these pinholes, the shot noise is considerably increased. The data presented clarify an often-observed discrepancy between measured and expected heterodyne mixer noise temperatures and predict a 25% increase in the receiver noise temperature of Nb SIS heterodyne detectors at 1 THz.
Originele taal-2English
Pagina's (van-tot)1653 - 1655
Aantal pagina's3
TijdschriftApplied Physics Letters
Volume72
Nummer van het tijdschrift13
DOI's
StatusPublished - 1998

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