Correlated States in Strained Twisted Bilayer Graphenes Away from the Magic Angle

Graphene moire??superlattice formed by rotating two graphene sheets can host strongly correlated and topologicalstates whenflat bands form at so-called magic angles. Here, we report that, for a twisting angle far away from the magic angle, theheterostrain induced during stacking heterostructures can also createflat bands. Combining a direct visualization of strain effect intwisted bilayer graphene moire??superlattices and transport measurements, features of correlated states appear at"non-magic"anglesin twisted bilayer graphene under the heterostrain. Observing correlated states in these"non-standard"conditions can enrich theunderstanding of the possible origins of the correlated states and widen the freedom in tuning the moire??heterostructures and thescope of exploring the correlated physics in moire??superlattices