Andreev reflection and momentum filtering in quantum-wire/superconductive-graphene/quantum-wire junction

TitleAndreev reflection and momentum filtering in quantum-wire/superconductive-graphene/quantum-wire junction
Publication TypeJournal Article
Year of Publication2011
AuthorsZhang GP, Wang CZ, Ho KM
Journal TitlePhysics Letters A
Volume375
Pages1043-1047
Date Published02
Type of ArticleArticle
ISBN Number0375-9601
Accession NumberISI:000287424100019
Keywordschain, CONDUCTIVITY, superconductors, TRANSPORT
Abstract

Transport property of superconductive armchair graphene ribbon (AGR) connected to quantum-wire (QW) contacts is investigated via Landauer formalism combined with transfer matrix method. The scattering at the AGR/QW interface induces an obvious asymmetry in conductance as gate voltage varies. The transmission peak is located at momentum k(y) = 2 pi/3 root 3a with a = 0.142 nm. Andreev reflection (AR) enhances electronic transmission in the presence of hole reflection process. At lowest carrier density, the conductance of AGR in superconductive state becomes constant while the counterpart of semiconductive AGR in normal state decays exponentially with the length. The conductance increases with pair potential at low carrier density. The interplay between superconductivity and the scattering at the AGR/QW interface guides future application of superconductive graphene ribbon. (C) 2011 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000287424100019
DOI10.1016/j.physleta.2010.12.082
Alternate JournalPhys. Lett. A