Spin polarization and Zeeman effects in ferromagnet/ferromagnetic pp-wave superconductor junctions

An extended Blonder–Tinkham–Klapwijk (BTK) approach is applied to study the spin polarization and Zeeman effects in ferromagnet/ferromagnetic pp-wave superconductor (FM/FpS) junctions. Three kinds of pairings for Fp  S are chosen: px,py,px+ipy waves. It is found that the normalized conductance strongly depends on both kinds of pairings and the relative orientations of the effective exchange field in the FM and FpS. In triplet superconductor junctions the multiplication of zero-energy Andreev bound states (ABSs) with the Zeeman effect induces an additional peak splitting. This property may serve as a method to identify triplet symmetry of ferromagnetic superconductors.

Research highlights
► Using an extended BTK theory study spin polarization and Zeeman effects in FM/FpS junctions.
► Three kinds of pairings for Fp  S are chosen: px,py,px+ipy waves.
► Dependence of conductance on pairings and exchange field orientations is obtained.
► The multiplication of ABSs with the Zeeman effect induces an additional peak splitting.
► Also, many novel features are revealed in FM/FpS junctions.