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Czechoslovak Journal of Physics

, Volume 46, Supplement 2, pp 659–660 | Cite as

Novel hybrid Nb/InAs/Nb step junctions

  • S. G. Lachenmann
  • A. Kastalsky
  • I. Friedrich
  • A. Förster
  • A. V. Ustinov
  • D. Uhlisch
LTSC—Tunnelling Phenomena, Layered Structures, Weak Links, Proximity Effects

Abstract

We present experimental results for novel superconductor/semiconductor heterostructure hybrid systems, which rely on the use of the two-dimensional electron gas at the surface of p-type InAs. The surface channel is made in an InAs step between Nb contacts. Such a geometry allows fabrication of short weak links (≈100 nm) as well as realization of a variety of heterostructure potential profiles along the channel since the latter is oriented perpendicular to the growth direction of the heterostructure. By measuring the current-voltage characteristics at 4.2 K, we observe supercurrent, subharmonic gap structure, as well as above gap structure and excess current. The junction transparency is estimated to exceed 70%.

Keywords

Andreev Reflection Excess Current Multiple Andreev Reflection Step Junction Supercurrent Transport 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. [1]
    T.M. Klapwijk, Physica B197, 481 (1994)CrossRefADSGoogle Scholar
  2. [2]
    H. Takayanagi and T. Kawakami, Phys. Rev. Lett.54, 2449 (1985)CrossRefADSGoogle Scholar
  3. [3]
    C. Nguyenet al., Appl. Phys. Lett.57, 87 (1990)CrossRefADSGoogle Scholar
  4. [4]
    T.M. Klapwijk, G.E. Blonder, and M. Tinkham, Physica B109&110, 1657 (1982)Google Scholar
  5. [5]
    G.E. Blonder, M. Tinkham, and T.M. Klapwijk, Phys. Rev. B25, 4515 (1982); M. Octavioet al., Phys. Rev. B27, 6739 (1983); K. Flensberg, J. Bindslev-Hansen, and M. Octavio, Phys. Rev. B38, 8707 (1988)CrossRefADSGoogle Scholar

Copyright information

© Institute of Physics, Acad. Sci. CR 1996

Authors and Affiliations

  • S. G. Lachenmann
    • 1
  • A. Kastalsky
    • 1
  • I. Friedrich
    • 1
  • A. Förster
    • 1
  • A. V. Ustinov
    • 1
  • D. Uhlisch
    • 1
  1. 1.Institut für Schicht- und InonentechnikForschungszentrum JülichJülichGermany

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