"Phase diffusion in single-walled carbon nanotube Josephson transistors" by Yong Zhang, Gang Liu et al.

Article Title

Phase diffusion in single-walled carbon nanotube Josephson transistors

Authors

Yong Zhang, § Present address: School of Physical Science & Technology, Southwest University, Chongqing 400715, China
Gang Liu, § Present address: School of Physical Science & Technology, Southwest University, Chongqing 400715, China
Chun Ning Lau, § Present address: School of Physical Science & Technology, Southwest University, Chongqing 400715, China

Keywords

Carbon nanotubes, Josephson junctions, quantum dot, electrical transport, supercurrent

Abstract

We investigate electronic transport in Josephson junctions formed by individual single-walled carbon nanotubes coupled to superconducting electrodes. We observe enhanced zero-bias conductance (up to 10e2/h) and pronounced sub-harmonic gap structures in differential conductance, which arise from the multiple Andreev refl ections at superconductor/nanotube interfaces. The voltage-current characteristics of these junctions display abrupt switching from the supercurrent branch to the resistive branch, with a gate-tunable switching current ranging from 65 pA to 2.5 nA. The fi nite resistance observed on the supercurrent branch and the magnitude of the switching current are in good agreement with the classical phase diffusion model for resistively and capacitively shunted junctions.