Experimental Observation of Surface States and Landau Levels Bending in Bilayer Graphene

Abstract

We report on microscopic measurements of the low-energy electronic structures both at zigzag and armchair edges of bilayer graphene using scanning tunneling microscopy and spectroscopy (STM and STS). We have found that, both in the absence and in the presence of a magnetic field, an almost zero-energy peak in density of states was localized at zigzag edges, as expected for the surface states at zigzag edges of bilayer graphene. In the quantum Hall regime, we have observed clearly Landau levels bending away from the charge neutrality point near both the zigzag and armchair edges. Such a result is a direct evidence for the evolution of Landau levels into the quantum Hall edge states in graphene bilayers. Our experiment indicates that it is possible to explore rich quantum Hall physics in graphene systems using STM and STS.

4 Figures in main text and 4 Figures in SI

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Cited by in corpus (21)

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• Recent progresses of quantum confinement in graphene quantum dots
• Long-range nontopological edge currents in charge-neutral graphene
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• Massless Dirac Fermions Trapping in a Quasi-one-dimensional npn Junction of a Continuous Graphene Monolayer
• High-magnetic-field Tunneling Spectra of ABC-Stacked Trilayer Graphene
• A Movable Valley Switch Driven by Berry Phase in Bilayer Graphene Resonators
• Spectroscopic visualization of flat bands in magic-angle twisted monolayer-bilayer graphene: localization-delocalization coexisting electronic states
• Diverse Magnetic Quantization in Bilayer Silicene
• Observation of Chirality Transition of Quasiparticles at Stacking Solitons in Trilayer Graphene
• Bilayer graphene under pressure: Electron-hole Symmetry Breaking, Valley Hall Effect, and Landau Levels
• Spatial Confinement, Magnetic Localization and Their Interactions on Massless Dirac Fermions
• Landau quantization in buckled monolayer GaAs
• High-resolution Tunneling Spectroscopy of ABA-stacked Trilayer Graphene
• Spectroscopic Characterization of Landau Level Splitting and the Intermediate v = 0 Phase in Bilayer Graphene
• Relativistic Generalized Uncertainty Principle and Its Implications
• Continuously Tunable Berry Phase and Valley-Polarized Energy Spectra in Bilayer Graphene Quantum Dots
• Direct observation of magneto-electric Aharonov-Bohm effect in moiré-scale quantum paths of minimally twisted bilayer graphene
• Corrugation induced stacking solitons with topologically confined states in gapped bilayer graphene
• Local Measurements of Shubnikov-de Haas Oscillations in Graphene Systems
• Quantization Phenomena of critical Hamiltonians in 2D systems