Electronic Structure and Kohn-Luttinger Superconductivity of Heavily-Doped Single-Layer Graphene

Abstract

The existence of superconductivity (SC) in graphene appears to be established in both twisted and non-twisted multilayers. However, whether their building block, single-layer graphene (SLG), can also host SC remains an open question. Earlier theoretical works predicted that SLG could become a chiral d-wave superconductor driven by electronic interactions when doped to its van Hove singularity, but questions such as whether the d-wave SC survives the strong band renormalizations seen in experiments, its robustness against the source of doping, or if it will occur at any reasonable critical temperature (Tc) have remained difficult to answer, in part due to uncertainties in model parameters. In this study, we adopt a random-phase approximation framework based on a Kohn-Luttinger-like mechanism to investigate SC in heavily-doped SLG. We predict that robust d+id topological SC could arise in SLG doped by Tb, with a Tc up to 600 mK. We also investigate the possibility of realizing d-wave SC by employing other dopants, such as Li or Cs. The structural models have been derived from angle-resolved photoemission spectroscopy measurements on Tb-doped graphene and first-principles calculations for Cs and Li doping. We find that dopants that change the lattice symmetry of SLG are detrimental to the d-wave state. The stability of the d-wave SC predicted here in Tb-doped SLG could provide a valuable insight for guiding future experimental efforts aimed at exploring topological superconductivity in monolayer graphene.

14 pages, 6 figures. Comments are very welcome

References in corpus (22)

• The Raman Fingerprint of Graphene
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• SIESTA: recent developments and applications
• Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene
• Superconductivity in rhombohedral trilayer graphene
• Density waves and Cooper pairing on the honeycomb lattice
• Kohn-Luttinger superconductivity in graphene
• Phonon-induced many-body renormalization of graphene electronic properties
• Competing orders at higher-order Van Hove points
• Superconductivity and correlated phases in non-twisted bilayer and trilayer graphene
• Superconductivity in graphite intercalation compounds
• Superconductivity in Twisted Double Bilayer Graphene Stabilized by WSe${}_2$
• Superconductivity from electronic interactions and spin-orbit enhancement in bilayer and trilayer graphene
• Van Hove Singularity and Apparent Anisotropy in the Electron-Phonon Interaction in Graphene
• Band Structure and Superconductivity in Twisted Trilayer Graphene
• Superconductivity induced by the inter-valley Coulomb scattering in a few layers of graphene
• Charge fluctuations, phonons and superconductivity in multilayer graphene
• Evolution of Superconductivity in Twisted Graphene Multilayers
• The Kohn-Luttinger superconductivity in idealized doped graphene
• High-temperature Majorana corner modes in a $d+i{d}^{\prime }$ superconductor heterostructure: Application to twisted bilayer cuprate superconductors
• Disorder-dependent superconducting pairing symmetry in doped graphene

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• Spin bond order driven by extended repulsive interactions in doped graphene