Superconducting junctions using AlGaAs/GaAs heterostructures with high Hc2 NbN electrodes

Hideaki Takayanagi, Tatsushi Akazaki, Minoru Kawamura, Yuichi Harada, Junsaku Nitta

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

We investigated a superconductor-semiconductor-superconductor junction formed by two superconducting NbN electrodes and a two-dimensional electron gas (2DEG) in an AlGaAs/GaAs heterostructure. We obtained a good ohmic contact between NbN/AuGeNi electrodes and 2DEG by annealing them at 450 °C for 1 min in an N2 atmosphere. We observed a decrease in the resistance caused by Andreev reflection (AR) within the superconducting energy gap voltage in a zero magnetic field in this structure. We found that the peculiar features of the magnetoresistance in the transition region can be qualitatively explained by considering the existence of the AR in high magnetic fields.

Original languageEnglish
Pages (from-to)922-926
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume12
Issue number1-4
DOIs
Publication statusPublished - 2002 Jan
Externally publishedYes
Event14th International Conference on the - Prague, Czech Republic
Duration: 2001 Jul 302001 Aug 3

Keywords

  • Andreev reflection
  • Edge state
  • Quantum Hall effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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