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

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Shot_noise_and_conductance_measurements_of_transparent_superconductor_two_dimensional_electron_gas_junctions.pdf
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2005

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Choi, Bong-Ryoul
Hansen, A. E.
Kontos, Takis
Hoffmann, C.
Oberholzer, Stefan
Schönenberger, Christian
Akazaki, Tatsushi
Takayanagi, Hideaki

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http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-32904
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https://doi.org/10.1103/PhysRevB.72.024501
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Attribution-NonCommercial-NoDerivs 2.0 Generic

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Physical Review B. 2005, 72, 024501. Available under: doi: 10.1103/PhysRevB.72.024501

Zusammenfassung

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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530 Physik

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ISO 690CHOI, Bong-Ryoul, A. E. HANSEN, Takis KONTOS, C. HOFFMANN, Stefan OBERHOLZER, Wolfgang BELZIG, Christian SCHÖNENBERGER, Tatsushi AKAZAKI, Hideaki TAKAYANAGI, 2005. Shot-noise and conductance measurements of transparent superconductor/two-dimensional electron gas junctions. In: Physical Review B. 2005, 72, 024501. Available under: doi: 10.1103/PhysRevB.72.024501
BibTex
@article{Choi2005Shotn-5094,
  year={2005},
  doi={10.1103/PhysRevB.72.024501},
  title={Shot-noise and conductance measurements of transparent superconductor/two-dimensional electron gas junctions},
  volume={72},
  journal={Physical Review B},
  author={Choi, Bong-Ryoul and Hansen, A. E. and Kontos, Takis and Hoffmann, C. and Oberholzer, Stefan and Belzig, Wolfgang and Schönenberger, Christian and Akazaki, Tatsushi and Takayanagi, Hideaki},
  note={Article Number: 024501}
}
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    <dcterms:abstract xml:lang="eng">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.</dcterms:abstract>
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