Graphene
moiré superlattice formed by rotating two graphene
sheets can host strongly correlated and topological states when flat
bands form at so-called magic angles. Here, we report that, for a
twisting angle far away from the magic angle, the heterostrain induced
during stacking heterostructures can also create flat bands. Combining
a direct visualization of strain effect in twisted bilayer graphene
moiré superlattices and transport measurements, features of
correlated states appear at “non-magic” angles in twisted
bilayer graphene under the heterostrain. Observing correlated states
in these “non-standard” conditions can enrich the understanding
of the possible origins of the correlated states and widen the freedom
in tuning the moiré heterostructures and the scope of exploring
the correlated physics in moiré superlattices.
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