Subharmonic gap structure in short ballistic graphene junctions
Superconductivity
2009-11-11 v1 Mesoscale and Nanoscale Physics
Abstract
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.
Cite
@article{arxiv.cond-mat/0609138,
title = {Subharmonic gap structure in short ballistic graphene junctions},
author = {J. C. Cuevas and A. Levy Yeyati},
journal= {arXiv preprint arXiv:cond-mat/0609138},
year = {2009}
}
Comments
revtex4, 4 pages, 4 figures