Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-08-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
We investigate electronic transport in Josephson junctions formed by single-walled carbon nanotubes coupled to superconducting electrodes. We observe enhanced zero-bias conductance (up to 10e^2/h) and pronounced sub-harmonic gap structures in differential conductance, which arise from the multiple Andreev reflections at superconductor/nanotube interfaces. The voltage-current characteristics of these junctions display abrupt switching from the supercurrent branch to resistive branch, with a gate-tunable switching current ranging from 50 pA to 2.3 nA. The finite resistance observed on the supercurrent branch and the magnitude of the switching current are in good agreement with calculation based on the model of classical phase diffusion.
Lau* Chun Ning
Liu Gaisheng
Zhang Yajing
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