Microscopic Polarization in Bilayer Graphene

Abstract

Bilayer graphene has drawn significant attention due to the opening of a band gap in its low energy electronic spectrum, which offers a promising route to electronic applications. The gap can be either tunable through an external electric field or spontaneously formed through an interaction-induced symmetry breaking. Our scanning tunneling measurements reveal the microscopic nature of the bilayer gap to be very different from what is observed in previous macroscopic measurements or expected from current theoretical models. The potential difference between the layers, which is proportional to charge imbalance and determines the gap value, shows strong dependence on the disorder potential, varying spatially in both magnitude and sign on a microscopic level. Furthermore, the gap does not vanish at small charge densities. Additional interaction-induced effects are observed in a magnetic field with the opening of a subgap when the zero orbital Landau level is placed at the Fermi energy.

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• Valley-spin polarized Landau levels in a monolayer semiconductor
• Accurate tight-binding and continuum models for the $\pi$ bands of bilayer graphene
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• Chemical Potential and Quantum Hall Ferromagnetism in Bilayer Graphene
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• Tuning Structures and Electronic Spectra of Graphene Layers by Tilt Grain Boundaries
• Gapped broken symmetry states in ABC trilayer graphene
• Charged-phonon theory and Fano effect in the optical spectroscopy of bilayer graphene
• Visualization and Control of Single Electron Charging in Bilayer Graphene Quantum Dots
• Atmospheric doping effects in epitaxial graphene: correlation of local and global electrical measurements
• Graphene under spatially varying external potentials: Landau levels, magnetotransport, and topological modes
• Unraveling quantum Hall breakdown in bilayer graphene with scanning gate microscopy
• The Coexistence of van Hove Singularities and Superlattice Dirac Points in a Slightly Twisted Graphene Bilayer
• Visualization and Manipulation of Bilayer Graphene Quantum Dots with Broken Rotational Symmetry and Nontrivial Topology
• Direct Probing Stacking Order and Electronic Spectrum of Rhombohedral Trilayer Graphene with Scanning Tunneling Microscopy
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• A Movable Valley Switch Driven by Berry Phase in Bilayer Graphene Resonators
• Diverse Magnetic Quantization in Bilayer Silicene
• Band Structure Mapping of Bilayer Graphene via Quasiparticle Scattering
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• Graphene: Kinks, Superlattices, Landau levels, and Magnetotransport
• Spatially resolving unconventional interface Landau quantization in a graphene monolayer-bilayer planar junction
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• Hot carrier relaxation of Dirac fermions in bilayer epitaxial graphene
• Marginally Self-Averaging One-Dimensional Localization in Bilayer Graphene
• Landau quantization in buckled monolayer GaAs
• dmu/dn In suspended bilayer graphene: the interplay of disorder and band gap
• High-resolution Tunneling Spectroscopy of ABA-stacked Trilayer Graphene
• Reading and writing charge on graphene devices
• Continuous and reversible tuning of the disorder-driven superconductor-insulator transition in bilayer graphene
• Dynamic Bandstructure and Capacitance Effects in Scanning Tunneling Spectroscopy of Bilayer Graphene
• Quantized coexisting electrons and holes in graphene measured using temperature dependent magneto-transport
• Chirality-2 fermion induced anti-Klein tunneling in 2D checkerboard lattice
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• Electronic Structures and Their Landau Quantizations in Twisted Graphene Bilayer and Trilayer
• Ising quantum Hall ferromagnetism in Landau levels $\left|N\right|\ge 1$ of bilayer graphene
• Spectroscopic Characterization of Landau Level Splitting and the Intermediate v = 0 Phase in Bilayer Graphene
• Trigonal warping, pseudodiffusive transport, and finite-system version of the Lifshitz transition in magnetoconductance of bilayer-graphene Corbino disks
• Minimal conductivity and signatures of quantum criticality in ballistic graphene bilayer
• Alloying 2D VSe2 with Pt: from a charge density wave state to a disordered insulator
• Intervalley quantum interference and measurement of Berry phase in bilayer graphene
• Optical Properties of Graphene in Magnetic and Electric fields
• Magnetoconductance of the Corbino disk in graphene: Chiral tunneling and quantum interference in the bilayer case
• Highly anisotropic scaling limits
• Infrared spectroscopy of phase transitions in the lowest Landau levels of bilayer graphene
• Corrugation induced stacking solitons with topologically confined states in gapped bilayer graphene
• Spatial variation of energy gap and Landau levels around gapped bilayer graphene domain walls
• Direct observation of magneto-electric Aharonov-Bohm effect in moiré-scale quantum paths of minimally twisted bilayer graphene
• Spectroscopic evidence for electron correlations in the interface-modulated epitaxial bilayer graphene
• Magnetic-field-assisted electron confinement and valley splitting in strained graphene