Critical and excess current through an open quantum dot: Temperature and magnetic field dependence

Abstract

We present measurements of temperature and magnetic field dependence of the critical current and excess current in a carbon nanotube Josephson quantum dot junction. The junction is fabricated in a controlled environment which allows for extraction of the full critical current. The measurements are performed in the open quantum dot regime, and fitted to theory with good qualitative agreement. We also show how to extract level spacing, level broadening, and charging energy of an open quantum dot from a bias spectroscopy plot.

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• Perturbation theory of a superconducting $0-\pi$ impurity quantum phase transition
• Perturbation theory for an Anderson quantum dot asymmetrically attached to two superconducting leads
• Josephson current through interacting double quantum dots with spin-orbit coupling
• Quantum dot attached to superconducting leads: Relation between symmetric and asymmetric coupling
• Josephson effect in a few-hole quantum dot
• Practical Guide to Quantum Phase Transitions in Quantum-Dot-Based Tunable Josephson Junctions
• Magneto-electric spectroscopy of Andreev bound states in Josephson quantum dots
• Giant Electron-hole Charging Energy Asymmetry in Ultra-short Carbon Nanotubes
• Many-body perturbation theory for the superconducting quantum dot: Fundamental role of the magnetic field
• Andreev spin relaxation time in a shadow-evaporated InAs weak link
• Spin-symmetric solution of an interacting quantum dot attached to superconducting leads: Andreev states and the $0-\pi$ transition