Strong-coupling topological states and phase transitions in helical trilayer graphene
Yves H. Kwan, Patrick J. Ledwith, Chiu Fan Bowen Lo, Trithep Devakul
Abstract
Helical trilayer graphene is a new experimentally accessible magic-angle graphene heterostructure with nontrivial physics at both the moir\'e and supermoir\'e scale. The authors' theoretical analysis reveals a plethora of topological strong-coupling Chern insulators at all integer moir\'e fillings. Crucially, the band renormalization that plagues previous moir\'e graphene systems is significantly suppressed, ensuring the validity of the strong-coupling perspective and opening the path to fractionalized phases. At experimentally accessible displacement fields, the authors find continuous topological transitions to more complex orders. Their results establish helical trilayer graphene as a promising platform for tunable strongly interacting topological phases.