Overdoping graphene beyond the van Hove singularity

Abstract

At very high doping levels the van Hove singularity in the ${\pi }^{\ast }$ band of graphene becomes occupied and exotic ground states possibly emerge, driven by many-body interactions. Employing a combination of ytterbium intercalation and potassium adsorption, we $n$ dope epitaxial graphene on silicon carbide past the ${\pi }^{\ast }$ van Hove singularity, up to a charge carrier density of 5.5$\times$10${}^{14}$ cm${}^{-2}$. This regime marks the unambiguous completion of a Lifshitz transition in which the Fermi surface topology has evolved from two electron pockets into a giant hole pocket. Angle-resolved photoelectron spectroscopy confirms these changes to be driven by electronic structure renormalizations rather than a rigid band shift. Our results open up the previously unreachable beyond-van-Hove regime in the phase diagram of epitaxial graphene, thereby accessing an unexplored landscape of potential exotic phases in this prototype two-dimensional material.

arXiv comment6 pages, 2 figures

References in corpus (30)

• The electronic properties of graphene
• Two-Dimensional Gas of Massless Dirac Fermions in Graphene
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Ultrathin epitaxial graphite: 2D electron gas properties and a route toward graphene-based nanoelectronics
• Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Magic Angle Spectroscopy
• Chiral superconductivity from repulsive interactions in doped graphene
• Topological Mott Insulators
• Strength of effective Coulomb interactions in graphene and graphite
• Interactions and phase transitions on graphene's honeycomb lattice
• Evidence for superconductivity in Li-decorated monolayer graphene
• Competing many-body instabilities and unconventional superconductivity in graphene
• Density waves and Cooper pairing on the honeycomb lattice
• The Ground State of the Pseudogap in Cuprate Superconductors
• Chiral d-wave superconductivity in doped graphene
• Fermi Condensation Near van Hove Singularities Within the Hubbard Model on the Triangular Lattice
• ARPES studies of cuprate Fermiology: superconductivity, pseudogap, and quasiparticle dynamics
• Topological Lifshitz transitions
• Illuminating the dark corridor in graphene: polarization dependence of angle-resolved photoemission spectroscopy on graphene
• Robustness of the van Hove scenario for high-Tc superconductors
• Phonon-induced many-body renormalization of graphene electronic properties
• Introducing strong correlation effects into graphene by gadolinium intercalation
• Spin-density-wave instability in graphene doped near the van Hove singularity
• Finding the bare band: Electron coupling to two phonon modes in potassium-doped graphene on Ir(111)
• Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates
• Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
• Manifestation of nonlocal electron-electron interaction in graphene
• Signatures of adatom effects in the quasiparticle spectrum of Li-doped graphene

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• Triplet superconductivity supported by an X${}_9$ high-order Van Hove singularity