Flat Electronic Bands in Long Sequences of Rhombohedral-stacked Multilayer Graphene

Abstract

The crystallographic stacking order in multilayer graphene plays an important role in determining its electronic properties. It has been predicted that a rhombohedral (ABC) stacking displays a conducting surface state with flat electronic dispersion. In such a flat band, the role of electron-electron correlation is enhanced possibly resulting in high Tc superconductivity, charge density wave or magnetic orders. Clean experimental band structure measurements of ABC stacked specimens are missing because the samples are usually too small in size. Here, we directly image the band structure of large multilayer graphene flake containing approximately 14 consecutive ABC layers. Angle-resolved photoemission spectroscopy experiments reveal the flat electronic bands near the K point extends by 0.13 Å-1 at the Fermi level at liquid nitrogen temperature. First-principle calculations identify the electronic ground state as an antiferromagnetic state with a band gap of about 40 meV.

References in corpus (8)

• Topological Crystalline Insulators
• First direct observation of Dirac fermions in graphite
• Transport studies of dual-gated ABC and ABA trilayer graphene: band gap opening and band structure tuning in very large perpendicular electric field
• Experimental approval of the extended flat bands and gapped subbands in rhombohedral multilayer graphene
• Magnetic gap opening in rhombohedral-stacked multilayer graphene from first principles
• Identification of a possible superconducting transition above room temperature in natural graphite crystals
• Ferromagnetism in ABC-trilayer graphene
• The Raman fingerprint of rhombohedral graphite

Cited by in corpus (29)

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• Ferromagnetic helical nodal line and Kane-Mele spin-orbit coupling in kagome metal Fe3Sn2
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• Layer-dependent evolution of electronic structures and correlations in rhombohedral multilayer graphene
• Incidence of multilayers in chemically exfoliated graphene
• Can the "shadow" of graphene band clarify its flatness?
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• Spectroscopic Signatures of Electronic Excitations in Raman Scattering in Thin Films of Rhombohedral Graphite
• Hybrid-functional electronic structure of multilayer graphene
• Superconductivity and magnetism in the surface states of ABC-stacked multilayer graphene
• Gate Tunable Magnetism and Giant Magnetoresistance in ABC-stacked Few-Layer Graphene
• Correlated topological flat bands in rhombohedral graphite
• Exchange interaction, disorder, and stacking faults in rhombohedral graphene multilayers
• Field-effect-driven half-metallic multilayer graphene
• Influence of surface band bending on a narrow band gap semiconductor: Tunneling atomic force studies of graphite with Bernal and rhombohedral stacking orders
• Competing magnetic states on the surface of multilayer ABC-stacked graphene
• ABC-stacked multilayer graphene in holography
• Solitons induced by an in-plane magnetic field in rhombohedral multilayer graphene
• Films of rhombohedral graphite as two-dimensional topological semimetals
• Low-Energy Electron Microscopy contrast of stacking boundaries: comparing twisted few-layer graphene and strained epitaxial graphene on silicon carbide
• Solitons in binary compounds with stacked two-dimensional honeycomb lattices
• Indirect to direct band gap crossover in two-dimensional WS2(1-x)Se2x alloys
• Using near-flat-band electrons for read-out of molecular spin qubit entangled states
• Electronic Structure of Multilayer Graphene with Arbitrary Stackings