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

Gate-tuned high frequency response of carbon nanotube Josephson junctions