Temperature dependence of critical currents in Nb/InAs/Nb Josephson junction arrays

We study extreme geometries in the field of 2DEG-coupled Josephson Junctions, at dilution refrigerator temperatures. The 2DEG is a continuous layer of InAs that contacts an overlying array of niobium stripes. The temperature dependence of other S–Semi–S systems has been studied in relatively small geometries. Our junctions are in a new regime with widths to View the MathML source and lengths of View the MathML source. We find temperature-dependences of the critical current, Ic, that are difficult to fit consistently with theories used for other InAs-based junctions.