Single-walled carbon nanotube weak links: from Fabry-P\'erot to Kondo regime
Abstract
We have investigated proximity-induced supercurrents in single-walled carbon nanotubes in the Kondo regime and compared them with supercurrents obtained on the same tube with Fabry-P\'erot resonances. Our data display a wide distribution of Kondo temperatures TK = 1 - 14 K, and the measured critical current ICM vs. TK displays two distinct branches; these branches, distinguished by zero-bias splitting of the normal-state Kondo conductance peak, differ by an order of magnitude at large values of TK. Evidence for renormalization of Andreev levels in Kondo regime is also found.
0