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Paper   IPM / Physic / 13141
School of Physics
  Title:   Valley and spin switch effect in molybdenum disulfide superconducting spin valve
  Author(s): 
1.  L. Majidi
2.  R. Asgari
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  90
  Year:  2014
  Pages:   165440
  Supported by:  IPM
  Abstract:
We propose a hole-doped molybdenum disulfide superconducting spin valve (F/S/F) hybrid structure in which the Andreev reflection process is suppressed for all incoming electrons with determined chemical potentials in ferromagnetic (F) region and the cross-conductance in the right F region depends crucially on the configuration of magnetizations in the two F regions. We find, by using the scattering formalism, that the transport is mediated purely by elastic electron cotunneling (CT) process in parallel configuration and changes to the pure crossed Andreev reflection (CAR) process in the low-energy regime, by reversing the direction of magnetization in the right F region. This suggests both valley and spin switch effect between the perfect elastic CT and perfect CAR processes and makes the nonlocal current to be fully valley and spin polarized inside the right F region, where the type of the polarization can be changed by reversing the magnetization direction in the right F region. Moreover, we demonstrate long-range CT and CAR processes in MoS2-based F/S/F structure in contrast to the corresponding gapped graphene structure.

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