Carbon Nanotube Quantum Dots with Nb Contacts

Abstract

We report on the preparation of carbon nanotube quantum dots using superconducting electrodes made of niobium. Gate-controllable supercurrents with values of up to 30 nA are induced by the proximity effect. The IV-curves are hysteretic at low temperature and the corresponding switching histograms have a width of ~0.5-2. An on-chip resistive environment integrated in the sample layout is used in order to increase the switching current.

7 pages, 3 figures

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• Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions
• Epitaxial Superconductor-Semiconductor Two-Dimensional Systems for Superconducting Quantum Circuits
• Progress in superconductor-semiconductor topological Josephson junctions
• Critical and excess current through an open quantum dot: Temperature and magnetic field dependence
• Niobium-based superconducting nano-devices fabrication using all-metal suspended masks
• Sub-gap spectroscopy of thermally excited quasiparticles in a Nb contacted carbon nanotube quantum dot
• First order $0/\pi$ quantum phase transition in the Kondo regime of a superconducting carbon nanotube quantum dot
• Thermally induced subgap features in the cotunneling spectroscopy of a carbon nanotube
• Many-body perturbation theory for the superconducting quantum dot: Fundamental role of the magnetic field
• Josephson junctions based on ultraclean carbon nanotubes
• Radio-frequency characterization of a supercurrent transistor made from a carbon nanotube