Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions

Francesco Giazotto; Kasper Grove-Rasmussen; Rosario Fazio; Fabio Beltram; Edmund H. Linfield; David A. Ritchie

Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions

Superconductivity 2007-05-23 v1 Mesoscale and Nanoscale Physics

Authors: Francesco Giazotto , Kasper Grove-Rasmussen , Rosario Fazio , Fabio Beltram , Edmund H. Linfield , David A. Ritchie

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Abstract

Highly transmissive ballistic junctions are demonstrated between Nb and the two-dimensional electron gas formed at an InAs/AlSb heterojunction. A reproducible fabrication protocol is presented yielding high critical supercurrent values. Current-voltage characteristics were measured down to 0.4 K and the observed supercurrent behavior was analyzed within a ballistic model in the clean limit. This investigation allows us to demonstrate an intrinsic interface transmissivity approaching 90%. The reproducibility of the fabrication protocol makes it of interest for the experimental study of InAs-based superconductor-semiconductor hybrid devices.

Keywords

josephson junctions josephson junctions and superconducting circuits superconducting tunnel junctions

Cite

@article{arxiv.cond-mat/0207337,
  title  = {Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions},
  author = {Francesco Giazotto and Kasper Grove-Rasmussen and Rosario Fazio and Fabio Beltram and Edmund H. Linfield and David A. Ritchie},
  journal= {arXiv preprint arXiv:cond-mat/0207337},
  year   = {2007}
}

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7 pages REVTeX, 3 figures

Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions

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