Abstract:We discuss spin dependent single particle charge transport as well as the spin pairwise entanglement processes in a double barrier junction. The junction consists of a superconductor connected to two normal or spin-polarized conductors, or semiconductors. Special attention is focused on a non-local process known as a crossed Andreev reflection. The non-local Andreev reflection occurs when an incident electron (hole) from one lead, injected with a subgap energy onto a superconducting layer, transforms into an A… Show more
“…In the following we use the formalism of Ref. [6] that was generalized to the spin dependent quantum transport in non-graphene [7,8] and graphene based (e.g. Refs.…”
We study the spin polarized electron and hole tunneling transport through a graphene-based ferromagnet(GF1)insulator(GI1)superconductor(GS)insulator(GI2)ferromagnet(GF2) junction.Proximity induced spin polarization and superconductivity in a graphene sheet are assumed to be created by superconducting and ferromagnetic electrodes placed on the top of the graphene. Using a four-dimensional version of the DiracBogoliubovde Gennes equation with appropriate boundary conditions we investigate the tunneling processes through the junctions. In particular, we present calculations of the amplitudes of normal and Andreev reections as a function of the energy of the incident electron for a wide range of the model parameters, such as the strength and orientation of the exchange eld, the barrier strength, and the distance between the two ferromagnetic layers. The tunneling transport processes in the graphene-based double junction GF/GI/GS/ GI/GF are compared with those in non-graphene-based junctions.
“…In the following we use the formalism of Ref. [6] that was generalized to the spin dependent quantum transport in non-graphene [7,8] and graphene based (e.g. Refs.…”
We study the spin polarized electron and hole tunneling transport through a graphene-based ferromagnet(GF1)insulator(GI1)superconductor(GS)insulator(GI2)ferromagnet(GF2) junction.Proximity induced spin polarization and superconductivity in a graphene sheet are assumed to be created by superconducting and ferromagnetic electrodes placed on the top of the graphene. Using a four-dimensional version of the DiracBogoliubovde Gennes equation with appropriate boundary conditions we investigate the tunneling processes through the junctions. In particular, we present calculations of the amplitudes of normal and Andreev reections as a function of the energy of the incident electron for a wide range of the model parameters, such as the strength and orientation of the exchange eld, the barrier strength, and the distance between the two ferromagnetic layers. The tunneling transport processes in the graphene-based double junction GF/GI/GS/ GI/GF are compared with those in non-graphene-based junctions.
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