Abstract
Based on the transfer-matrix method, we have investigated the coherent quantum transport in a graphene-based normal metal–insulator–superconductor ( NG / IG / SG ) junctions, in the limit of a thin barrier. It is found that the conductance spectra of such system, in contrast to a π periodic oscillatory behavior is shown for aligned Fermi surfaces of the normal and superconducting regions, exhibit a new π / 2 periodic oscillatory behavior as a function of barrier strength ( χ) for a large Fermi surface mismatch.
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