title: Signals for specular Andreev reflection.
abstract: We report a theoretical investigation of the spin-dependent Andreev reflection at the interface of a graphene-based ferromagnet/superconductor junction. It is found that the ferromagnetic exchange interaction in the ferromagnet can suppress Andreev retroreflection but enhance the specular Andreev reflection. There is a transition between the specular Andreev reflection and Andreev retroreflection at which the shot noise vanishes and the Fano factor has a universal value. The present work provides a new method of detecting the specular Andreev reflection, which can be experimentally tested within the present-day technique.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China.
authors.forename: Qingyun
authors.initials: Q
authors.lastname: Zhang
authors.forename: Deyi
authors.initials: D
authors.lastname: Fu
authors.forename: Baigeng
authors.initials: B
authors.lastname: Wang
authors.forename: R
authors.initials: R
authors.lastname: Zhang
authors.forename: D Y
authors.initials: DY
authors.lastname: Xing