Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions

B. R. Choi; A. E. Hansen; T. Kontos; C. Hoffmann; S. Oberholzer; W. Belzig; C. Schönenberger; T. Akazaki; H. Takayanagi

doi:10.1103/PhysRevB.72.024501

Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions

B. R. Choi^*, A. E. Hansen, T. Kontos, C. Hoffmann, S. Oberholzer, W. Belzig, C. Schönenberger, T. Akazaki, H. Takayanagi

^*Corresponding author for this work

35 Citations (Scopus)

Abstract

We have measured the conductance and shot noise of superconductor-normal metal (S-N) junctions between a niobium (Nb) film and a two-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a sub-micrometer beam splitter. The current shot noise measured through one arm of the beam splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching ≈60-70 %. The present device can be seen as a quasi-ballistic S-N beam-splitter junction.

Original language	English
Article number	024501
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	72
Issue number	2
ISSN	1098-0121
DOIs	https://doi.org/10.1103/PhysRevB.72.024501
Publication status	Published - 1 Jul 2005
Externally published	Yes

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Choi, B. R., Hansen, A. E., Kontos, T., Hoffmann, C., Oberholzer, S., Belzig, W., Schönenberger, C., Akazaki, T., & Takayanagi, H. (2005). Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions. Physical Review B - Condensed Matter and Materials Physics, 72(2), Article 024501. https://doi.org/10.1103/PhysRevB.72.024501

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title = "Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions",

abstract = "We have measured the conductance and shot noise of superconductor-normal metal (S-N) junctions between a niobium (Nb) film and a two-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a sub-micrometer beam splitter. The current shot noise measured through one arm of the beam splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching ≈60-70 \%. The present device can be seen as a quasi-ballistic S-N beam-splitter junction.",

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T1 - Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions

AU - Choi, B. R.

AU - Hansen, A. E.

AU - Kontos, T.

AU - Hoffmann, C.

AU - Oberholzer, S.

AU - Belzig, W.

AU - Schönenberger, C.

AU - Akazaki, T.

AU - Takayanagi, H.

PY - 2005/7/1

Y1 - 2005/7/1

N2 - We have measured the conductance and shot noise of superconductor-normal metal (S-N) junctions between a niobium (Nb) film and a two-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a sub-micrometer beam splitter. The current shot noise measured through one arm of the beam splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching ≈60-70 %. The present device can be seen as a quasi-ballistic S-N beam-splitter junction.

AB - We have measured the conductance and shot noise of superconductor-normal metal (S-N) junctions between a niobium (Nb) film and a two-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a sub-micrometer beam splitter. The current shot noise measured through one arm of the beam splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching ≈60-70 %. The present device can be seen as a quasi-ballistic S-N beam-splitter junction.

UR - https://www.scopus.com/pages/publications/33644963619

U2 - 10.1103/PhysRevB.72.024501

DO - 10.1103/PhysRevB.72.024501

M3 - Journal article

AN - SCOPUS:33644963619

SN - 1098-0121

VL - 72

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 2

M1 - 024501

ER -

Shot-noise and conductance measurements of transparent superconductor/two- dimensional electron gas junctions

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