Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-05-09
Phys. Rev. B 76, 155404 (2007)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 2 figures; corrected discussion
Scientific paper
10.1103/PhysRevB.76.155404
We investigate the Cooper-pair propagation and the proximity effect in graphene under conditions in which the distance L between superconducting electrodes is much larger than the width W of the contacts. In the case of undoped graphene, supercurrents may exist with a spatial decay proportional to W^2/L^3. This changes upon doping into a 1/L^2 behavior, opening the possibility to observe a supercurrent over length scales above 1 micron at suitable doping levels. We also show that there is in general a crossover temperature T ~ v_F/k_B L that marks the onset of the strong decay of the supercurrent, and that corresponds to the scale below which the Cooper pairs are not disrupted by thermal effects during their propagation.
Gonzalez Jesús J.
Perfetto Enrico
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