Scanning tunneling microscopy and spectroscopy of nanoscale twisted bilayer graphene

Abstract

Nanoscale twisted bilayer graphene (TBG) is quite instable and will change its structure to Bernal (or AB-stacking) bilayer with a much lower energy. Therefore, the lack of nanoscale TBG makes its electronic properties not accessible in experiment up to now. In this work, a special confined TBG is obtained in the overlaid area of two continuous misoriented graphene sheets. The width of the confined region of the TBG changes gradually from about 22 nm to 0 nm. By using scanning tunnelling microscopy, we studied carefully the structure and the electronic properties of the nanoscale TBG. Our results indicate that the low-energy electronic properties, including twist-induced van Hove singularities (VHSs) and spatial modulation of local density-of-state, are strongly affected by the translational symmetry breaking of the nanoscale TBG. Whereas, the electronic properties above the energy of the VHSs are almost not influenced by the quantum confinement even when the width of the TBG is reduced to only a single moire spot.

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References in corpus (25)

• Half-Metallic Graphene Nanoribbons
• Moire bands in twisted double-layer graphene
• Graphene bilayer with a twist: electronic structure
• Observation of Van Hove singularities in twisted graphene layers
• Flat Bands in Slightly Twisted Bilayer Graphene
• Room temperature magnetic order on zigzag edges of narrow graphene nanoribbons
• Strain Solitons and Topological Defects in Bilayer Graphene
• Unravelling the intrinsic and robust nature of van Hove singularities in twisted bilayer graphene
• Non-Abelian gauge potentials in graphene bilayers
• Creating and Probing Electron Whispering Gallery Modes in Graphene
• Few layers graphene on 6H-SiC(000-1): an STM study
• Local spectroscopy of moiré-induced electronic structure in gate-tunable twisted bilayer graphene
• Macroscopic self-reorientation of interacting two-dimensional crystals
• Wave function mapping in graphene quantum dots with soft confinement
• Quantum confined electronic states in atomically well-defined graphene nanostructures
• Chiral Tunnelling in Twisted Graphene Bilayer
• Experimental evidence for non-Abelian gauge potentials in twisted graphene bilayers
• Networks of ABA and ABC stacked graphene on mica observed by scanning tunneling microscopy
• Landau Quantization and Fermi Velocity Renormalization in Twisted Graphene Bilayers
• Energy gaps of atomically precise armchair graphene nanoribbons
• Angle-Dependent van Hove Singularities and Their Breakdown in Twisted Graphene Bilayers
• The Coexistence of van Hove Singularities and Superlattice Dirac Points in a Slightly Twisted Graphene Bilayer
• Stacking transition in bilayer graphene caused by thermally activated rotation
• Hydrogen assisted growth of high quality epitaxial graphene on the C-face of 4H-SiC
• Creating and probing wide-bandgap nanoribbon-like structures in a continuous metallic graphene sheet

Cited by in corpus (4)

• Heterostrain engineering on twisted graphene bilayer around the first magic angle
• Scanning tunneling microscopy and spectroscopy of twisted trilayer graphene
• Twistronics in graphene-based van der Waals structures
• Tunable lattice reconstruction and bandwidth of flat bands in magic-angle twisted bilayer graphene