Tunneling spectroscopy of graphene nanodevices coupled to large-gap superconductors

Abstract

We performed tunneling spectroscopy measurements of graphene coupled to niobium/niobium-nitride superconducting electrodes. Due to the proximity effect, the graphene density of states depends on the phase difference between the superconductors and exhibits a hard induced gap at zero phase, consistent with a continuum of Andreev bound states. At energies larger than the superconducting gap, we observed phase-dependent energy levels displaying the Coulomb blockade effect, which are interpreted as arising from spurious quantum dots, presumably embedded in the heterostructures and coupled to the proximitized graphene.

arXiv comment5 pages, 3 figures, Supplemental Material

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Cited by in corpus (16)

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• Tunnel spectroscopy of localised electronic states in hexagonal boron nitride
• Mechanisms of Andreev reflection in quantum Hall graphene
• Spectroscopy of $NbS{e}_2$ using Energy-Tunable Defect-Embedded Quantum Dots
• 1/f critical current noise in short ballistic graphene Josephson junctions
• Topological Andreev Rectification
• Effect of dilute impurities on short graphene Josephson junctions
• Controllable Andreev Bound States in Bilayer Graphene Josephson Junction from Short to Long Junction Limits
• FeTe${}_{0.55}$Se${}_{0.45}$ van der Waals Tunneling Devices
• Tuning the supercurrent distribution in parallel ballistic graphene Josephson junctions
• Spin relaxation, Josephson effect and Yu-Shiba-Rusinov states in superconducting bilayer graphene
• Probing the Electronic Structure of Graphene Near and Far from the Fermi Level via Planar Tunneling Spectroscopy
• Nonequilibrium Andreev resonances in ballistic graphene Andreev interferometers
• Local analysis of a single impurity on a graphene Josephson Junction
• Determination of the current-phase relation of an InAs 2DEG Josephson junction with a microwave resonator
• Coupling of Klein-Andreev Resonant States in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$-graphene-Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ Devices