Observation of Andreev reflection enhanced shot noise

P Dieleman*, H.G. Bukkems, T.M Klapwijk, M. Schicke, K.H. Gundlach

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

99 Citaten (Scopus)

Samenvatting

We have experimentally investigated the quasiparticle shot noise in NbN/MgO/NbN superconductor-insulator-superconductor tunnel junctions. The observed shot noise is significantly larger than theoretically expected. We attribute this to the occurrence of multiple Andreev reflection processes in pinholes present in the MgO barrier. This mechanism causes the current to flow in large charge quanta (Andreev clusters), with a voltage dependent average value of m approximate to 1 + 2 Delta/eV times the electron charge. Because of this charge enhancement effect, the shot noise is increased by the factor m.

Originele taal-2English
Pagina's (van-tot)3486-3489
Aantal pagina's4
TijdschriftPhysical Review Letters
Volume79
Nummer van het tijdschrift18
StatusPublished - 3-nov-1997

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