Spin-controlled superconductivity and tunable triplet correlations in graphene nanostructures

Abstract

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 ${\mu }_F$ of the F regions or varies the angle $\theta$ between exchange field orientations. Superconductivity can then be switched on and off by varying either $\theta$ or ${\mu }_F$ (a spin-controlled superconducting graphene switch). The induced equal-spin triplet correlations in S can be controlled by tuning ${\mu }_F$, effectively making a graphene based two-dimensional spin-triplet valve.

To appear in Phys Rev. Lett

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• Half-Metallic Superconducting Triplet Spin MultiValves
• Critical supercurrent and ${\varphi }_0$ state for probing a persistent spin helix
• Josephson Currents and Spin Transfer Torques in Ballistic SFSFS Nanojunctions
• Proximity Induced Vortices and Long-Range Triplet Supercurrents in Ferromagnetic Josephson Junctions and Spin Valves
• Valley- and spin-switch effects in molybdenum disulfide superconducting spin valve
• Creation of spin-triplet Cooper pairs in the absence of magnetic ordering
• Magnetoanisotropic spin-triplet Andreev reflection in ferromagnet-Ising superconductor junctions
• Symmetry of superconducting correlations in displaced bilayers of graphene
• Qualitative analysis of trapped Dirac fermions in graphene
• Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene
• Spin-dependent thermoelectric effects in graphene based superconductor junctions
• Increasing the performance of the superconducting spin valve using a Heusler alloy
• Spin-polarized multiple Andreev reflections in spin-split superconductors
• Anomalous current-voltage characteristics of SFIFS Josephson junctions with weak ferromagnetic interlayers
• Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F$|$NCSC$|$F spin valve
• Magnetic Switching in Weyl Semimetal-Superconductor Heterostructures
• Effect of Rashba spin-orbit coupling, magnetization and mixing of gap parameter on tunnelling conductance in F$|$NCSC junction of an F$|$S$|$F spin valve
• Signatures of enhanced spin-triplet superconductivity induced by interfacial properties
• Stealth Majorana Zero Mode in a Trilayer Heterostructure MnTe/Bi2Te3/Fe(Te,Se)
• Tunable magnetoresistance in spin-orbit coupled graphene junctions
• Revisiting Andreev processes in superconductor-graphene-superconductor (SGS) Josephson junctions: Comparison with experimental results
• Electrical and thermal transport in a twisted heterostructure of transition metal dichalcogenide and CrI${}_3$ connected to a superconductor