Spin-dependent thermoelectric effects in graphene based superconductor junctions

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 3.5$k_B/e$ and 2.5$k_B/e$, 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.

10 pages, 9 figures

References in corpus (29)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Chiral tunneling and the Klein paradox in graphene
• Room-Temperature Quantum Hall Effect in Graphene
• Graphene Spintronics
• Unconventional Integer Quantum Hall effect in graphene
• Andreev reflection and Klein tunneling in graphene
• Spin Seebeck insulator
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
• Spin-orbit gap of graphene: First-principles calculations
• Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene
• Specular Andreev reflection in graphene
• Anisotropic behaviors of massless Dirac fermions in graphene under periodic potential
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Spin-Orbit Proximity Effect in Graphene
• Magnetic confinement of massless Dirac fermions in graphene
• Annealing Free, Clean Graphene Transfer using Alternative Polymer Scaffolds
• Quantum Hall effect in graphene with superconducting electrodes
• Long-range spin-polarized quasiparticle transport in mesoscopic Al superconductors with a Zeeman splitting
• Spin-dependent Seebeck effect and spin caloritronics in magnetic graphene
• Andreev-Klein reflection in graphene ferromagnet-superconductor junctions
• Tunable Anomalous Andreev Reflection and Triplet Pairings in Spin Orbit Coupled Graphene
• General framework for transport in spin-orbit-coupled superconducting heterostructures: Nonuniform spin-orbit coupling and spin-orbit-active interfaces
• Heat transport by Dirac fermions in normal/superconducting graphene junctions
• Transport in Graphene Tunnel Junctions
• Spin transport in graphene nanostructures
• Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation
• Seebeck effects in two-dimensional spin transistors