Spin-Controlled Superconductivity and Tunable Triplet Correlations in Graphene Nanostructures
Klaus Halterman, Oriol T. Valls, Mohammad Alidoust
DOI 10.1103/PhysRevLett.111.046602 · Physical Review Letters
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Abstract
We study graphene ferromagnet/superconductor/ferromagnet (F/S/F) nanostructures via a microscopic self-consistent Dirac Bogoliubov–de Gennes formalism. We show that as a result of proximity effects, experimentally accessible spin switching phenomena can occur as one tunes the Fermi level μF of the F regions or varies the angle θ between exchange field orientations. Superconductivity can then be switched on and off by varying either θ or μF (a spin-controlled superconducting graphene switch). The induced equal-spin triplet correlations in S can be controlled by tuning μF, effectively making a graphene based two-dimensional spin-triplet valve.
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