Competition between the Superconducting Proximity Effect and Coulomb Interactions in a Graphene Andreev Interferometer

We have investigated transport through graphene Andreev interferometers exhibiting reentrance of the superconducting proximity effect. We observed a crossover in the Andreev conductance oscillations as a function of gate voltage ($V_{BG}$). At high $V_{BG}$ the energy-dependent oscillation amplitude exhibits a scaling predicted for non-interacting electrons, which breaks down at low $V_{BG}$. The phenomenon is a manifestation of electron-electron interactions, whose main effect is to shorten the single-particle phase coherence time $τ_ϕ$. These results indicate that graphene provides a useful experimental platform to investigate the competition between superconducting proximity effect and interactions.

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