Spin-dependent thermoelectric effects in graphene-based superconductorjunctions

Using the Bogoliubov-de Gennes formalism, we investigate the charge and spin-dependentthermoelectriceffects in graphene-based superconductorjunctions. Theresults demonstrate that despite normal-superconductor junctions, there is atemperature-dependent spin thermopower in both the graphene-based ferromagnetic-superconductorand ferromagnetic-Rashba spin-orbit region-superconductor junctions. It is also shownthat in the presence of Rashba spin-orbit interaction, the charge and spin-dependent Seebeckcoefficients reach their maximum up to 3.5 kB/e and 2.5 kB/e, respectively. Remarkably, these coefficients have azero-point critical value with respect to the magnetic exchange field and chemical potential. Thiseffectdisappears when the Rashba coupling is absent. These results suggest that graphene-basedsuperconductorscan be used in spin-caloritronic devices.