2013/04/24 by Deon, Fabio, Šopić, Sandra, Morpurgo, Alberto F.
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.1304.6578
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 (VBG). At high VBG the energy-dependent oscillation amplitude exhibits a scaling predicted for non-interacting electrons, which breaks down at low VBG. The phenomenon is a manifestation of electron-electron interactions, whose main effect is to shorten the single-particle phase coherence time τϕ. These results indicate that graphene provides a useful experimental platform to investigate the competition between superconducting proximity effect and interactions.