Correlated States in Strained Twisted Bilayer Graphenes Away from the Magic Angle.
basic_science · Level V
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- Record sourced from PubMed, PMID 35385281.
- Also identified by DOI 10.1021/acs.nanolett.1c04400 and PMC identifier 9052762.
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Abstract
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.