Imaging topological torus lattice from an electron crystal in twisted mono-bilayer graphene

Abstract

A variety of exotic quantum phases of matter have been created by Van der Waals heterostructures. Moreover, these twisted heterostructures provide a feasible way of braiding correlation effect and nontrivial band topology together. Here, through a comprehensive spectrum study, we report the discovery of topological torus lattice in twisted mono-bilayer graphene. The strong Coulomb correlations give rise to an unusual charge localization behavior within the moiré supercell, leading to an electron crystal. The nontrivial band topology is encoded into the electron crystal, which would result in spatial modulated Chern numbers, and is evidenced by an emergent topological torus lattice state. Our result illustrates an efficient strategy for entwining and engineering topological physics with a strong electron correlation.

References in corpus (2)

• 2D materials and van der Waals heterostructures
• Phase separation in a two-band model for strongly correlated electrons

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• Exact Many-Body Ground States from Decomposition of Ideal Higher Chern Bands: Applications to Chirally Twisted Graphene Multilayers
• Topological flat bands in rhombohedral tetralayer and multilayer graphene on hexagonal boron nitride moire superlattices
• Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
• Chern-Textured Exciton Insulators with Valley Spiral Order in Moiré Materials
• Perpendicular electronic transport and moiré-induced resonance in twisted interfaces of three-dimensional graphite
• Shift current response in twisted double bilayer graphenes
• General Many-Body Perturbation Framework for Moiré Systems