Crossed Andreev reflection in normal-superconductor-normal junction based on Kekulé-Y patterned graphene

We theoretically study the crossed Andreev reflection (CAR) of the normal metal-superconductor-normal metal (NSN) heterojunction based on Kekul & eacute;-Y patterned graphene with two doping types, i.e. nSn and nSp configurations. It is found that the enhanced CAR is more likely to occur in the nSp junction rather than the nSn junction. To be concrete, the almost perfect CAR occurs in a large range of incident angle in the single Dirac cone phase when the incident energy is inside the gap of the nonlinear band. Furthermore, the roles of the length of superconductor and pseudospin-valley coupling on conductance are also evaluated.