Spin-controlled superconductivity and tunable triplet correlations in graphene nanostructures.
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.
Michelson Lab, Physics Division, Naval Air Warfare Center, China Lake, California 93555, USA. klaus.halterman@navy.mil
Klaus
K
Halterman
Oriol T
OT
Valls
Mohammad
M
Alidoust