Josephson current in ballistic Nb/InAs/Nb highly transmissive junctions
Francesco Giazotto (1), Kasper Grove-Rasmussen (1), Rosario Fazio (1),, Fabio Beltram (1), Edmund H. Linfield (2), and David A. Ritchie (2) ((1), NEST-INFM & Scuola Normale Superiore, Pisa, Italy, (2) Cavendish Laboratory,, University of Cambridge, Cambridge, United Kingdom)
TL;DR
This paper demonstrates highly transmissive ballistic Nb/InAs/Nb Josephson junctions with a reproducible fabrication process, achieving near 90% interface transmissivity and providing insights into supercurrent behavior in superconductor-semiconductor hybrids.
Contribution
It introduces a reproducible fabrication protocol for high-transmissivity Nb/InAs/Nb junctions and analyzes their supercurrent behavior within a ballistic model.
Findings
Achieved interface transmissivity approaching 90%
Demonstrated high critical supercurrent values
Validated ballistic model analysis of supercurrent
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.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Superconductivity in MgB2 and Alloys · Superconducting and THz Device Technology