Gate-tuned high frequency response of carbon nanotube Josephson junctions

Details Gate-tuned high frequency response of carbon nanotube Josephson junctions Gate-tuned high frequency response of carbon nanotube Josephson junctions

2007-05-14

arxiv.org/abs/0705.2033v1

Phys. Rev. Lett. 99, 117001 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 8 figures

Scientific paper

10.1103/PhysRevLett.99.117001

Carbon nanotube (CNT) Josephson junctions in the open quantum dot limit exhibit superconducting switching currents which can be controlled with a gate electrode. Shapiro voltage steps can be observed under radiofrequency current excitations, with a damping of the phase dynamics that strongly depends on the gate voltage. These measurements are described by a standard RCSJ model showing that the switching currents from the superconducting to the normal state are close to the critical current of the junction. The effective dynamical capacitance of the nanotube junction is found to be strongly gate-dependent, suggesting a diffusive contact of the nanotube.

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