Weak and Strong Moire Potentials from hBN Alignment Orientation in Rhombohedral Graphene

Neither rhombohedral multilayer graphene (RMG) nor hBN are centrosymmetric. When RMG is stacked on top of hBN, the twist angle alone does not uniquely specify the moire system. The "alignment orientation" ξ = 0 or 1 --- which specifies alignment near 0 or π degrees --- is also required. Crucially, one alignment creates a weak moire potential while the other creates a strong moire potential. This talk explains the mechanism behind this difference, and examines its theoretical consequences for the many-body phase diagram of rhombohedral graphene, focusing on the moire-proximate side. We find the phase diagram is entirely reshuffled by the alignment, leading to the presence or absence of Chern bands. We conclude with experimental implications and methods to detect the alignment orientation.