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arxiv: cond-mat/0207337 · v1 · submitted 2002-07-13 · ❄️ cond-mat.supr-con · cond-mat.mes-hall

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) , David A. Ritchie (2) ((1) NEST-INFM & Scuola Normale Superiore , Pisa , Italy
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(2) Cavendish Laboratory University of Cambridge Cambridge United Kingdom)
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classification ❄️ cond-mat.supr-con cond-mat.mes-hall
keywords ballisticfabricationhighlyinasjunctionsprotocolsupercurrenttransmissive
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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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