Single Wall Carbon Nanotube Weak Links

TL;DR

This paper reports on the fabrication and analysis of superconducting contacts to single wall carbon nanotubes, revealing signatures of supercurrent and proximity effects in different electronic regimes.

Contribution

It demonstrates reproducible superconducting contacts to SWCNTs and explores their behavior in Coulomb blockade and Kondo regimes, highlighting proximity-induced supercurrents.

Findings

Superconducting signatures observed in both Coulomb blockade and Kondo regimes.

Presence of a zero bias peak indicating proximity-induced supercurrent.

Distinct electronic regimes characterized by transparency levels.

Abstract

We have reproducibly contacted gated single wall carbon nanotubes (SWCNT) to superconducting leads based on niobium. The devices are identified to belong to two transparency regimes: The Coulomb blockade and the Kondo regime. Clear signature of the superconducting leads is observed in both regimes and in the Kondo regime a narrow zero bias peak interpreted as a proximity induced supercurrent persist in Coulomb blockade diamonds with Kondo resonances.