Proximity Induced Superconductivity and Multiple Andreev Reflections in Few-Layer-Graphene

Abstract

We have investigated electronic transport of few-layer-graphene (FLG) connected to superconducting electrodes. The device is prepared by mechanical exfoliation of graphite. A small mesa of FLG is placed on the surface of an insulating Alumina layer over silicon substrate, and is connected with two tungsten electrodes, separated by 2.5 microns, grown by focused ion beam. While tungsten electrodes are superconducting below 4 K, proximity induced superconductivity in FLG is observed below 1K with a large differential resistance drop at low bias. Signatures of multiple Andreev reflections are observed as peaks located at voltages corresponding to sub-multiple values of the superconducting gap of the electrodes.

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Cited by in corpus (9)

• Andreev reflection and Klein tunneling in graphene
• Phase Coherent Transport of Charges in Graphene Quantum Billiard
• Andreev reflection in graphene nanoribbons
• Microscopic theory of the proximity effect in superconductor-graphene nanostructures
• Near zero modes in condensate phases of the Dirac theory on the honeycomb lattice
• Long range Josephson coupling through ferromagnetic graphene
• Cooper-pair propagation and superconducting correlations in graphene
• Critical currents in graphene Josephson junctions
• $\pi$-junction qubit in monolayer graphene