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

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Cited by in corpus (13)

• $4\pi$-periodic Josephson supercurrent in HgTe-based topological Josephson junctions
• Observation of the 4$\pi$-periodic Josephson effect in indium arsenide nanowires
• Superconductivity-enhanced bias spectroscopy in carbon nanotube quantum dots
• Interaction of a Nanomagnet with a Weak Superconducting Link
• Interplay Between Electron Over-Heating and ac Josephson Effect
• Gate Tunable Dissipation and "Superconductor-Insulator" Transition in Carbon Nanotube Josephson Transistors
• Critical and excess current through an open quantum dot: Temperature and magnetic field dependence
• Microwave studies of the fractional Josephson effect in HgTe-based Josephson junctions
• Kapitsa pendulum effects in Josephson junction + nanomagnet under external periodic drive
• First order $0/\pi$ quantum phase transition in the Kondo regime of a superconducting carbon nanotube quantum dot
• Renormalization of the tunnel splitting in a rotating nanomagnet
• Controlling superconducting transistor by coherent light
• Wideband superconducting nanotube electrometer