Subharmonic gap structure in short ballistic graphene junctions

Details Subharmonic gap structure in short ballistic graphene junctions Subharmonic gap structure in short ballistic graphene junctions

2006-09-06

arxiv.org/abs/cond-mat/0609138v1

Phys. Rev. B 74, 180501 (2006).

Physics

Condensed Matter

Superconductivity

revtex4, 4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.74.180501

We present a theoretical analysis of the current-voltage characteristics of a ballistic superconductor-normal-superconductor (SNS) junction, in which a strip of graphene is coupled to two superconducting electrodes. We focus in the short-junction regime, where the length of the strip is much smaller than superconducting coherence length. We show that the differential conductance exhibits a very rich subharmonic gap structure which can be modulated by means of a gate voltage. On approaching the Dirac point the conductance normalized by the normal-state conductance is identical to that of a short diffusive SNS junction.

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