Valley protected one-dimensional states in small-angle twisted bilayer graphene
arXiv:2109.04128 · doi:10.1103/PhysRevB.103.165134
Abstract
Theory predicts that the application of an electric field breaks the inversion symmetry of AB and BA stacked domains in twisted bilayer graphene, resulting in the formation of a triangular network of one-dimensional valley-protected helical states. This two-dimensional network of one-dimensional states has been observed in several studies, but direct experimental evidence that the electronic transport in these one-dimensional states is valley-protected is still lacking. In this study, we report the existence of the network in small-angle twisted bilayer graphene at room temperature. Moreover, by analyzing Fourier transforms of atomically resolved scanning tunnelling microscopy images of minimally twisted bilayer graphene, we provide convincing experimental evidence that the electronic transport in the counter-propagating one-dimensional states is indeed valley protected.
arXiv comment4 pages, 3 figures
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- Stacking domain morphology in epitaxial graphene on silicon carbide
- Electrically tunable correlated domain wall network in twisted bilayer graphene
- Localized states coupled to a network of chiral modes in minimally twisted bilayer graphene
- Physical Origin of Current Partition at a Topological Trifurcation
- Arrays of one-dimensional conducting channels in minimally twisted bilayer graphene
- Winding Berry dipole on uniaxially strained graphene/hBN/hBN moiré trilayers
- Low-Energy Electron Microscopy contrast of stacking boundaries: comparing twisted few-layer graphene and strained epitaxial graphene on silicon carbide
- Topologically protected one-dimensional electronic states in group IV two-dimensional Dirac materials
- Quasi-two-dimensional spin helix and magnon-induced singularity in twisted bilayer graphene
- Network model and four-terminal transport in minimally twisted bilayer graphene
- Effects of spin-orbit coupling in a valley chiral kagomé network
- Coupled-wire descriptions of unconventional quantum states in twisted nanostructures