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

^*Bijbehorende auteur voor dit werk

Faculty of Science and Engineering

Onderzoeksoutput: Article › Academic › peer review

102 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-2	English
Pagina's (van-tot)	3486-3489
Aantal pagina's	4
Tijdschrift	Physical Review Letters
Volume	79
Nummer van het tijdschrift	18
Status	Published - 3-nov.-1997

Handle.net

Permanente koppeling

Citeer dit

@article{128cc06a8c294263bb044adb54dc08d2,

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",

month = nov,

day = "3",

language = "English",

volume = "79",

pages = "3486--3489",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "AMER PHYSICAL SOC",

number = "18",

}

TY - JOUR

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 -