Thursday, July 4, 2013

1307.0546 (Klaus Halterman et al.)

Spin-controlled superconductivity and tunable triplet correlations in
graphene nanostructures

Klaus Halterman, Oriol T. Valls, Mohammad Alidoust
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 $\mu_F$ of the F regions or varies the angle $\theta$ between exchange field orientations. Superconductivity can then be switched on and off by varying either $\theta$ or $\mu_F$ (a spin-controlled superconducting graphene switch). The induced equal-spin triplet correlations in S can be controlled by tuning $\mu_F$, effectively making a graphene based two-dimensional spin-triplet valve.
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