Magic-angle helical trilayer graphene.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37672575.
- Also identified by DOI 10.1126/sciadv.adi6063 and PMC identifier 10482339.
- Licence recorded as CC BY-NC.
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Abstract
We propose magic-angle helical trilayer graphene (HTG), a helical structure featuring identical rotation angles between three consecutive layers of graphene, as a unique and experimentally accessible platform for realizing exotic correlated topological states of matter. While nominally forming a supermoiré (or moiré-of-moiré) structure, we show that HTG locally relaxes into large regions of a periodic single-moiré structure realizing flat topological bands carrying nontrivial valley Chern number. These bands feature near-ideal quantum geometry and are isolated from remote bands by a very large energy gap, making HTG a promising platform for experimental realization of correlated topological states such as integer and fractional quantum anomalous Hall states.