Magic-angle helical trilayer graphene

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 supermoir & eacute; (or moir & eacute;-of-moir & eacute;) structure, we show that HTG locally relaxes into large regions of a periodic single-moir & eacute; 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.

Automated summary

We propose magic-angle helical trilayer graphene (HTG) as a platform for realizing exotic correlated topological states of matter, and provide experimental evidence and theoretical explanations.