Andreev reflection in graphene nanoribbons

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dc.creatorRainis, Diego
dc.creatorTaddei, Fabio
dc.creatorDolcini, Fabrizio
dc.creatorPolini, Marco
dc.creatorFazio, Rosario
dc.date2008-06-27
dc.date.accessioned2026-07-07T12:56:39Z
dc.date.available2026-07-07T12:56:39Z
dc.descriptionWe study Andreev reflection in graphene nanoribbon/superconductor hybrid junctions. By using a tight-binding approach and the scattering formalism we show that finite-size effects lead to notable differences with respect to the bulk graphene case. At subgap voltages, conservation of pseudoparity, a quantum number characterizing the ribbon states, yields either a suppression of Andreev reflection when the ribbon has an even number of sites in the transverse direction or perfect Andreev reflection when the ribbon has an odd number of sites. In the former case the suppression of Andreev reflection induces an insulating behavior even when the junction is biased; electron conduction can however be restored by applying a gate voltage.
dc.description6 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/0806.4475
dc.identifierhttp://arxiv.org/abs/0806.4475
dc.identifierPhys. Rev. B 79, 115131 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.115131
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224657
dc.subjectMesoscale and Nanoscale Physics
dc.titleAndreev reflection in graphene nanoribbons
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