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We present a theoretical analysis of the current-voltage characteristics of aballistic superconductor-normal-superconductor (SNS) junction, in which a stripof graphene is coupled to two superconducting electrodes. We focus in theshort-junction regime, where the length of the strip is much smaller thansuperconducting coherence length. We show that the differential conductanceexhibits a very rich subharmonic gap structure which can be modulated by meansof a gate voltage. On approaching the Dirac point the conductance normalized bythe normal-state conductance is identical to that of a short diffusive SNSjunction.Comment: revtex4, 4 pages, 4 figure

Subharmonic gap structure in short ballistic graphene junctions