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Cooper-pair propagation and superconducting correlations in graphene

AuthorsGonzález Carmona, José ; Perfetto, E.
Issue Date3-Oct-2007
PublisherAmerican Physical Society
CitationPhysical Review B - Condensed Matter and Materials Physics 76: 155404 (2007)
AbstractWe investigate the Cooper-pair propagation and the Josephson 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, we show that supercurrents may exist with a spatial decay proportional to W2 L3, reminiscent of the behavior of the critical current in disordered normal metals. We observe that there is in general a crossover temperature T* ∼ vF kB L that marks the onset of the strong decay of the supercurrent and that corresponds to the scale above which the Cooper pairs are disrupted by thermal effects during their propagation. We also show that the spatial decay of the critical current changes upon doping into a 1 L2 behavior, opening the possibility to observe a supercurrent over length scales above 1 μm at suitable doping levels. © 2007 The American Physical Society.
Description5 págs.; 3 figs.; PACS number s : 81.05.Uw, 74.45. c, 74.78.Na, 73.23. b
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.76.155404
Identifiersdoi: 10.1103/PhysRevB.76.155404
issn: 1098-0121
Appears in Collections:(CFMAC-IEM) Artículos
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