Gate-tuned high frequency response of carbon nanotube Josephson junctions

Abstract

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.

14 pages, 8 figures

References in corpus (1)

• Quantum supercurrent transistors in carbon nanotubes

Cited by in corpus (5)

• Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots
• Interaction of a Nanomagnet with a Weak Superconducting Link
• Critical and excess current through an open quantum dot: Temperature and magnetic field dependence
• Gate Tunable Dissipation and "Superconductor-Insulator" Transition in Carbon Nanotube Josephson Transistors
• Renormalization of the tunnel splitting in a rotating nanomagnet