Local Compressibility Measurements of Correlated States in Suspended Bilayer Graphene

Abstract

Bilayer graphene has attracted considerable interest due to the important role played by many-body effects, particularly at low energies. Here we report local compressibility measurements of a suspended graphene bilayer. We find that the energy gaps at filling factors v = 4 do not vanish at low fields, but instead merge into an incompressible region near the charge neutrality point at zero electric and magnetic field. These results indicate the existence of a zero-field ordered state and are consistent with the formation of either an anomalous quantum Hall state or a nematic phase with broken rotational symmetry. At higher fields, we measure the intrinsic energy gaps of broken-symmetry states at v = 0, 1 and 2, and find that they scale linearly with magnetic field, yet another manifestation of the strong Coulomb interactions in bilayer graphene.

9 pages, including 4 figures and supplementary materials

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Cited by in corpus (29)

• The electronic properties of bilayer graphene
• Lattice Theory of Pseudospin Ferromagnetism in Bilayer Graphene: Competing Orders and Interaction Induced Quantum Hall States
• Minimum Conductivity and Evidence for Phase Transitions in Ultra-clean Bilayer Graphene
• Strained bilayer graphene: Band structure topology and Landau level spectrum
• Tunable Layer Circular Photogalvanic Effect in Twisted Bilayers
• Electronic multicriticality in bilayer graphene
• Antiferromagnetism in the Hubbard Model on the Bernal-stacked Honeycomb Bilayer
• Edge excitations of the canted antiferromagnetic phase of the $\nu =0$ quantum Hall state in graphene: a simplified analysis
• Transport Gap in Suspended Bilayer Graphene at Zero Magnetic Field
• Interacting electrons on trilayer honeycomb lattices
• Transport in disordered monolayer molybdenum disulfide nanoflakes: evidence for inhomogeneous charge transport
• Spontaneous Layer-Pseudospin Domain Walls in Bilayer Graphene
• Magneto-optical and optical probes of gapped ground states of bilayer graphene
• Distinct Competing Ordered ν=2 States in Bilayer Graphene
• Flat band electrons and interactions in rhombohedral trilayer graphene
• Structure and the Lamb-shift-like quantum splitting of the pseudo-zero-mode Landau levels in bilayer graphene
• Electronic Instabilities of the AA-Honeycomb Bilayer
• Pseudo-magnetic field distribution and pseudo-Landau levels in suspended graphene flakes
• Spontaneous Layer Polarization and Conducting Domain Walls in the Quantum Hall Regime of Bilayer Graphene
• Quantum multicriticality of bilayer graphene in the presence of a tunable energy gap
• Excitonic Instabilities and Insulating States in Bilayer Graphene
• Landau Levels of Bilayer Graphene in a WSe${}_2$/Bilayer Graphene van der Waals Heterostructure
• Coulomb center instability in bilayer graphene
• Inhomogeneity and nonlinear screening in gapped bilayer graphene
• Many-body effects, orbital mixing and cyclotron resonance in bilayer graphene
• Broken symmetry states in bilayer graphene in electric and in-plane magnetic fields
• Chiral universality class of the normal-superconducting and the exciton condensation transition on the surface of topological insulator
• Optical manifestations of symmetry breaking in bilayer graphene
• Dynamical polarization in ABC-stacked multilayer graphene in a magnetic field