Tunable lattice reconstruction and bandwidth of flat bands in magic-angle twisted bilayer graphene
arXiv:2007.01993
Abstract
The interplay between interlayer van der Waals interaction and intralayer lattice distortion can lead to structural reconstruction in slightly twisted bilayer graphene (TBG) with the twist angle being smaller than a characteristic angle θc. Experimentally, the θc is demonstrated to be very close to the magic angle (θ ~ 1.05°). In this work, we address the transition between reconstructed and unreconstructed structures of the TBG across the magic angle by using scanning tunnelling microscopy (STM). Our experiment demonstrates that both the two structures are stable in the TBG around the magic angle. By applying a STM tip pulse, we show that the two structures can be switched to each other and the bandwidth of the flat bands, which plays a vital role in the emergent strongly correlated states in the magic-angle TBG, can be tuned. The observed tunable lattice reconstruction and bandwidth of the flat bands provide an extra control knob to manipulate the exotic electronic states of the TBG near the magic angle.
arXiv comment4 figures in main text
References in corpus (31)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Moire bands in twisted double-layer graphene
- Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
- Graphene bilayer with a twist: electronic structure
- Observation of Van Hove singularities in twisted graphene layers
- Magic Angle Spectroscopy
- Imaging Electronic Correlations in Twisted Bilayer Graphene near the Magic Angle
- Single Layer Behavior and Its Breakdown in Twisted Graphene Layers
- Raman spectroscopy study of rotated double-layer graphene: Misorientation-angle dependence of electronic structure
- Lattice relaxation and energy band modulation in twisted bilayer graphenes
- Topological confinement in bilayer graphene
- Unravelling the intrinsic and robust nature of van Hove singularities in twisted bilayer graphene
- Valley Chern Numbers and Boundary Modes in Gapped Bilayer Graphene
- An exact continuum model for low-energy electronic states of twisted bilayer graphene
- Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
- Direct imaging of topological edge states at a bilayer graphene domain wall
- Electronic spectrum of twisted graphene layers under heterostrain
- Helical networks in twisted bilayer graphene under interlayer bias
- Valley Polarization and Inversion in Strained Graphene via Pseudo-Landau Levels, Valley Splitting of Real Landau Levels and Confined States
- Bistability and oscillatory motion of natural nano-membranes appearing within monolayer graphene on silicon dioxide
- Heterostrain engineering on twisted graphene bilayer around the first magic angle
- Experimental evidence for orbital magnetic moments generated by moiré-scale current loops in twisted bilayer graphene
- Perfect and controllable nesting in the small angle twist bilayer graphene
- The emergence of one-dimensional channels in marginal-angle twisted bilayer graphene
- Scanning tunneling microscopy and spectroscopy of twisted trilayer graphene
- Magnetic-field-controlled negative differential conductance in graphene npn junction resonators
- Scanning tunneling microscopy and spectroscopy of nanoscale twisted bilayer graphene
- Observation of Giant Quantized Phonon Modes in Graphene via Tunneling Spectra
- Creating Nanostructured Superconductors On Demand by Local Current Annealing
- Electron interactions in strain-induced zero-energy flat band in twisted bilayer graphene near the magic angle