Observation of Andreev reflection enhanced shot noise

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

Observation of Andreev reflection enhanced shot noise

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

^*Corresponding author for this work

Faculty of Science and Engineering

Research output: Contribution to journal › Article › Academic › peer-review

96 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	3486-3489
Number of pages	4
Journal	Physical Review Letters
Volume	79
Issue number	18
Publication status	Published - 3-Nov-1997

Keywords

SUPERCONDUCTING TUNNEL-JUNCTIONS

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Cite this

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title = "Observation of Andreev reflection enhanced shot noise",

abstract = "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.",

keywords = "SUPERCONDUCTING TUNNEL-JUNCTIONS",

author = "P Dieleman and H.G. Bukkems and T.M Klapwijk and M. Schicke and K.H. Gundlach",

note = "Journal NOV 3 YE565 PHYS REV LETT",

year = "1997",

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day = "3",

language = "English",

volume = "79",

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T1 - Observation of Andreev reflection enhanced shot noise

AU - Dieleman, P

AU - Bukkems, H.G.

AU - Klapwijk, T.M

AU - Schicke, M.

AU - Gundlach, K.H.

N1 - Journal NOV 3 YE565 PHYS REV LETT

PY - 1997/11/3

Y1 - 1997/11/3

N2 - 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.

AB - 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.

KW - SUPERCONDUCTING TUNNEL-JUNCTIONS

M3 - Article

SN - 0031-9007

VL - 79

SP - 3486

EP - 3489

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

ER -