Abstract
We have theoretically investigated the modulation between the opposite- and equal-spin pairings and the related transport properties in silicene-based ferromagnet/ferromagnet/superconductor hybrid structures with noncollinear magnetizations. Due to the exotic electronic properties of silicene, the exclusive fully spin-polarized equal-spin pairing state appears without any contamination from the opposite-spin pairing state in a perpendicular magnetic configuration. Furthermore, the switch effect between fully spin-polarized opposite- and equal-spin pairings can be realized by tuning the Fermi level. In addition, the fully spin-polarized equal-spin pairing correlation can be enhanced by modulation of the magnitude and orientation of the exchange field in the central region. It is also a significant finding that for the formation of the fully spin-polarized equal-spin pairing state, the length of the central layer can be taken to be large, but not for opposite-spin pairing. Our findings provide an ideal platform to explore fully spin-polarized opposite- and equal-spin pairing states separately.
Highlights
With the advent of graphene and topological insulators [1,2], the study of Dirac fermions has become one of the most active research fields in condensed matter systems due to their exotic physical properties and potential applications over the past decade
We have theoretically investigated the modulation between the opposite- and equal-spin pairings and the related transport properties in silicene-based ferromagnet/ferromagnet/superconductor hybrid structures with noncollinear magnetizations
It is highly desirable to fabricate and separate the opposite- and equal-spin pairings in transport processes. Motivated by this purpose and the spin-orbit coupling-induced energy gap of silicene, in this paper, we investigate the modulation between spin pairing states and the corresponding subgap conductance in a silicene-based FFS superconducting hybrid structure with noncollinear magnetizations in the two F layers
Summary
With the advent of graphene and topological insulators [1,2], the study of Dirac fermions has become one of the most active research fields in condensed matter systems due to their exotic physical properties and potential applications over the past decade. Zhang studied the transport properties of graphene-based FFS junctions with noncollinear magnetizations [34] He found that for an exchange energy larger than the superconducting gap, the novel AR manifests itself as subgap differential conductance peaks because of the formation of spin-flipped Andreev bound states in the intermediate F layer. It is highly desirable to fabricate and separate the opposite- and equal-spin pairings in transport processes Motivated by this purpose and the spin-orbit coupling-induced energy gap of silicene, in this paper, we investigate the modulation between spin pairing states and the corresponding subgap conductance in a silicene-based FFS superconducting hybrid structure with noncollinear magnetizations in the two F layers. We consider a silicene-based FFS junction with noncollinear magnetizations, as illustrated, where a silicene sheet is deposited on the substrate in the x-y plane, with F and S representing proximity-induced ferromagnetic and superconducting layers, respectively.
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