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A finite-size normal conductor, proximity-coupled to a superconductor hasbeen predicted to exhibit a so-called minigap, in which quasiparticleexcitations are prohibited. Here, we report on the direct observation of such aminigap in ballistic graphene, coupled to superconducting MoRe leads. Theminigap is probed by finite bias spectroscopy through a weakly coupled junctionin the graphene region and its value is given by the dimensions of the device.Besides the minigap, we observe a distinct peak in the differential resistance,which we attribute to weakly coupled Andreev bound states (ABS) located nearthe superconductor-graphene interface. For weak magnetic fields, the phaseaccumulated in the normal-conducting region shifts the ABS in quantitativeagreement with predictions from tight-binding calculations based on theBogolioubov-de Gennes equation as well as with an analytical semiclassicalmodel.

Minigap and Andreev bound states in ballistic graphene