Electronic transport of single-wall carbon nanotubes with superconducting contacts

The electrical transport properties of an individual single-wall carbon nanotube (SWCNT) with superconducting contacts have been studied below 1 K. Depending on the contact resistance between the SWCNT and the metallic contact, the samples were categorized in two different regimes in this study. In the strong coupling regime with ignored Coulomb blockade effect, the zero-voltage conductance enhancement due to the superconducting proximity effect was observed as well as the multi-Andreev reflection (MAR) processes. In the weaker coupling regime, a signature of the Kondo effect was observed when the contact metals were in the normal state. When they were in the superconducting state, the MAR processes were observed, which appeared to be related to the Kondo effect.