Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase

Abstract

The magnetic state of a quantum dot attached to superconducting leads is experimentally shown to be controlled by the superconducting phase difference across the dot. This is done by probing the relation between the Josephson current and the superconducting phase difference of a carbon nanotube junction whose Kondo energy and superconducting gap are of comparable size. It exhibits distinctively anharmonic behavior, revealing a phase mediated singlet to doublet transition. We obtain an excellent quantitative agreement with numerically exact quantum Monte Carlo calculations. This provides strong support that we indeed observed the finite temperature signatures of the phase controlled zero temperature level-crossing transition originating from strong local electronic correlations.

5 pages, 4 figures + supp. materials

References in corpus (7)

• Tunable Supercurrent Through Semiconductor Nanowires
• Supercurrent reversal in quantum dots
• Kondo effect in quantum dots
• Spectral properties of locally correlated electrons in a BCS superconductor
• Critical Current 0-$\pi$ Transition in Designed Josephson Quantum Dot Junctions
• Josephson current through a single Anderson impurity coupled to BCS leads
• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot

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• Long-lived Andreev states as evidence for protected hinge modes in a bismuth nanoring Josephson junction
• Double-quantum-dot Andreev molecules: Phase diagrams and critical evaluation of effective models
• Unified theory of quantum phase transitions in quantum dots with gapped host bands
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• Many-body perturbation theory for the superconducting quantum dot: Fundamental role of the magnetic field
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• Spin-resolved spectroscopy of helical Andreev bound states
• Microwave susceptibility observation of interacting many-body Andreev states
• Probing the topological protection of edge states in multilayer tungsten ditelluride with the superconducting proximity effect
• Slave-spin approach to the Anderson-Josephson quantum dot
• Andreev bound states in Superconductor-quantum dot Josephson junction at infinite-U limit