![]() Spectroscopy of a tunable moiré system with a correlated and topological flat band. Tunable correlation-driven symmetry breaking in twisted double bilayer graphene. Tunable correlated states and spin-polarized phases in twisted bilayer–bilayer graphene. Spin-polarized correlated insulator and superconductor in twisted double bilayer graphene. Correlated states in twisted double bilayer graphene. Charge order and broken rotational symmetry in magic-angle twisted bilayer graphene. Superconductors, orbital magnets and correlated states in magic-angle bilayer graphene. Urgell, C., Watanabe, K., Taniguchi, T., Zhang, G. Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene. Electronic correlations in twisted bilayer graphene near the magic angle. Maximized electron interactions at the magic angle in twisted bilayer graphene. ![]() Tuning superconductivity in twisted bilayer graphene. Unconventional superconductivity in magic-angle graphene superlattices. Correlated insulator behaviour at half-filling in magic-angle graphene superlattices. Our modelling suggests that the nematic instability is not associated with the local scale of the graphene lattice, but is an emergent phenomenon at the scale of the moiré lattice.Ĭao, Y. We show that the nematic phase is a primary order that arises from the normal metal state over a wide range of doping away from charge neutrality. We demonstrate that the magnitude of the rotational symmetry breaking does not depend on the degree of the heterostrain or the displacement field, being instead a manifestation of an interaction-driven electronic nematic phase. Using spectroscopic imaging over large and uniform areas to characterize the direction and degree of C 3 symmetry breaking, we find it to be prominent only at energies corresponding to the flat bands and nearly absent in the remote bands. Here, we report the existence of three-fold rotational ( C 3) symmetry breaking in twisted double bilayer graphene. However, the presence of other correlation-driven phases in twisted graphitic systems at non-integer fillings is unclear. At integer fillings of these flat bands, energy gaps due to strong electron–electron interactions are generally observed. Graphene moiré superlattices display electronic flat bands.
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