Andreev reflection in a patterned graphene nanoribbon superconducting heterojunction.

Abstract In the study, an improved superconducting heterojunction is made up of a zigzag graphene nanoribbon, which is patterned by a triangle and supports localized edge mode. Since all the localized edge modes stem from a pattern operation, the structure features of the pattern exert an enormous function on the coherent quantum transport. Especially, the patterned modes can enhance the Andreev reflection largely both in the ferromagnetic nanoribbon edge and the antiferromagnetic nanoribbon edge. The spin resolved zero bias conductances, in sharp contrast to its counterpart in the infinite width superconducting heterojunction, exhibit the different dependence on the patterned ferromagnetic interaction. Highlights • We propose a zigzag graphene nanoribbon graphene nanoribbon/superconductor heterojunction which is patterned by the triangle and supports localized edge mode. • The energy band and density of the states in the central scattering region have a closed relationship with the localized edge mode. • Patterned modes can enhance the Andreev reflection largely in the subgap both in the ferromagnetic nanoribbon edge and antiferromagnetic nanoribbon edge. • Spin-resolved zero-bias conductances exhibit the different dependence on the patterned ferromagnetic interaction. [ABSTRACT FROM AUTHOR]