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

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

2005-10-07

arxiv.org/abs/cond-mat/0510200v4

Phys. Rev. Lett. 96, 207003 (2006)

Physics

Condensed Matter

Superconductivity

10 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.96.207003

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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