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Paper   IPM / Physic / 14636
School of Physics
  Title:   Spin-dependent thermoelectric e ects in graphene based superconductor junctions
  Author(s): 
1.  R. Beiranvand
2.  H. Hamzehpour
  Status:   Published
  Journal: J. Appl. Phys.
  No.:  6
  Vol.:  121
  Year:  2017
  Pages:   063903
  Supported by:  IPM
  Abstract:
Using the Bogoliubov de-Gennes formalism, we investigate the charge and spin-dependent thermoelectric effects in superconductor graphene junctions. Results demonstrate that despite normal-superconductor junctions, there is a temperature-dependent spin thermopower both in the graphene-based ferromagnetic-superconductor (F-S) and ferromagnetic-Rashba spin-orbit region-superconductor (F-RSO-S) junctions. It is also shown that in the presence of Rashba spin-orbit interaction, the charge and spin-dependent Seebeck coefficients can reach to their maximum up to 3.5kB/e and 2.5kB/e, respectively. Remarkably, these coefficients have a zero-point critical value with respect to magnetic exchange field and chemical potential. This effect disappears when the Rashba coupling is absent. These results suggest that graphene-based superconductors can be used in spin-caloritronics devices.

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