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Electron transport in single wall carbon nanotube weak links in the Fabry-Perot regime

H. I. Jørgensen·K. Grove-Rasmussen·T. Novotný·K. Flensberg·P. E. Lindelof
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Abstract

We fabricated reproducible high transparency superconducting contacts consisting of superconducting Ti/Al/Ti trilayers to gated single-walled carbon nanotubes (SWCNTs). The reported semiconducting SWCNT have normal state differential conductance up to $3e^2/h$ and exhibit clear Fabry-Perot interference patterns in the bias spectroscopy plot. We observed subharmonic gap structure in the differential conductance and a distinct peak in the conductance at zero bias which is interpreted as a manifestation of a supercurrent. The gate dependence of this supercurrent as well as the excess current are examined and compared to a coherent theory of superconducting point contacts with good agreement.

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H. I. Jørgensen, K. Grove-Rasmussen, T. Novotný, K. Flensberg, P. E. Lindelof. 2006-03-16. Electron transport in single wall carbon nanotube weak links in the Fabry-Perot regime. https://doi.org/10.1103/physrevlett.96.207003

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